Malicious PDF — malware analysis report

Static analysis result for SHA-256 0785e2ca2348f32b…

MALICIOUS

PDF

153.0 KB Created: 2021-04-08 05:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24fbabc283c5447b237b2d6b38d2bb71 SHA-1: b0bfa0bd982ea81897303cbc084000a698ec0b7d SHA-256: 0785e2ca2348f32bba753de8490e83ae4d9a0a9aeb6a9a222a1d7b76b4a2939f
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This, combined with the ML classifier and ClamAV detection, strongly indicates malicious intent. The document likely serves as a lure to a phishing or malware distribution site, leveraging the embedded URL for redirection. No scripts were extracted, but the presence of malicious links is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9282

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=muffin+song+roblox+id In PDF document text
    • http://fakexexu.sportsontheweb.net/asus_router_rt-n56u_access_point.pdfIn PDF document text
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/neropotimif-worod-jefazilubaw.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/functional_analysis_yosida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601615b2ce97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_603945df5d4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_600cd1b573f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_603c4abb906db.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/razupeniwuwak-fuporatif-fixagipox-difefilinuwe.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/7c18e6d333f193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_6046bde738b84.pdfIn PDF document text
    • https://bikawinudom.weebly.com/uploads/1/3/4/5/134595305/1526110b8267381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_4f81e120eef640dab692fb487519bb88.pdf?index=trueIn PDF document text
    • http://fufolozanija.epizy.com/34266464579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcb2858-afcb-40d2-87c1-ab8d38c67e49/construction_cost_handbook_philippines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d434028-22da-42bd-b55f-f137a81903b9/tempstar_ac_reviews_2020.pdfIn PDF document text
    • http://lopotenunuguw.rf.gd/72484346939.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_1dba34ca5d6e4f4b83ee6d15509550dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a568250a-3d19-4efc-abbe-3f2e4e8beeda/ti-84_plus_ce_graphing_calculator_battery.pdfIn PDF document text
    • http://negikapivipen.epizy.com/analytical_and_logical_reasoning_questions_and_answers.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_7db9671d0a0647f29ef69ed9473dc283.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca27e8ac-233f-4f33-8943-5c5becd49774/software_development_project_management_plan_example.pdfIn PDF document text
    • http://wipidomi.rf.gd/5792238393.pdfIn PDF document text
    • http://kikisitakas.rf.gd/craftsman_briggs_and_stratton_platinum_190cc.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19170 6676 bytes
SHA-256: 657ecd41de71d6cc26ea63214dcfece046f6447d6d4f661ddd1c7c509279b1e4
font_01_sfnt_off0001a215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A215 9504 bytes
SHA-256: 2cc574b863ce294921fd98fa3999b8c15a56612779b5fb72ff0a802d53e59036
font_02_sfnt_off0001c28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C28D 5080 bytes
SHA-256: 931a8c2ed8b33efaef1b773fdd14a745a6381481c8b3a828dbc79b342d6a51a5
font_03_sfnt_off0001d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3F2 9808 bytes
SHA-256: d825613f8e69c5791d536cc5f93e6dccf68c69f525a849a60186c4c7bc65579c
font_04_sfnt_off0001f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4A4 15464 bytes
SHA-256: 5de23fc9c057ca7faeedaf1912267930cace9924633df4edf0eb085b3caa4660
font_05_sfnt_off000227b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227B8 18936 bytes
SHA-256: c93461ccb2dabf92ffdadee02110b4c2bf42c3973e937c41d01d2e7eec2aacd7
font_06_sfnt_off00024545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24545 6092 bytes
SHA-256: 199de17b37d980607652dc3a581408f9830330031120ba242c89a21cc59fa666

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