Malicious PDF — malware analysis report

Static analysis result for SHA-256 1296307b0db94635…

MALICIOUS

PDF

81.9 KB Created: 2021-04-03 00:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac484df19184c31d0f769f54a4ebd5f1 SHA-1: c80f0b3a3bf5698900a0f9d39999ca762ee10940 SHA-256: 1296307b0db94635f528c4921d1cf1b3c2fd1cf35b7a54c4b5c2960369d2a58c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests the document is part of a link farm on disposable hosting, likely intended to lure users to malicious sites. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=find+the+volume+of+a+hemisphere+worksheet In PDF document text
    • http://bogplaktnc.fun/87604244396iabhj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fdc57db65ed3.pdfIn PDF document text
    • http://reweder.site/pezer8otcn.pdfIn PDF document text
    • http://waxevamebe.22web.org/sekimivez.pdfIn PDF document text
    • http://mmmmmme.space/dowupiks151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464862/normal_5fd7c3f5e5651.pdfIn PDF document text
    • http://mscredit.info/23488608240itjdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5fe64c6e4cf0e.pdfIn PDF document text
    • http://sibasijiv.22web.org/inspire_science_grade_4_worksheets.pdfIn PDF document text
    • http://kezedidakopu.iblogger.org/competition_law_uk.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/something_anything_nothing_grammar.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/cisco_ccnp_book.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/bearing_capacity_of_soil_ppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d4d87ff3-18f3-4eb0-beba-3f903636aba4/denotulodixem.pdfIn PDF document text
    • http://roxusenedo.epizy.com/dapibitobirejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e007afa-c245-4a2c-8da2-804fcaa61681/veropebebelitumesulisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60a47d5-018a-4983-ab80-c4b786b92bf6/brother_ce_4000_bobbin.pdfIn PDF document text
    • http://puxabilaxomim.rf.gd/coloring_pages_for_adults_animals.pdfIn PDF document text
    • http://mizozibobekujul.rf.gd/mugenivolorij.pdfIn PDF document text
    • http://podixisuxusajez.rf.gd/castoriadis_l_institution_imaginaire_de_la_socit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2768bf78-cc05-494e-8598-817be1a4a8e8/sketchup_3d_warehouse_down.pdfIn PDF document text
    • http://vezexosewomex.epizy.com/windows_10_1809_creation_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6bbfad-3f8c-4b52-a5b1-b815928af3fa/xepepab.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 5332 bytes
SHA-256: 52097f290015086a0635ec9b4a1c1853726470b5f8fb27788a3ab5695ea70e9a
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 10796 bytes
SHA-256: ccc00f06930077d4efe1e17c88e037f51f7c677c5b0f5616982bd9dbfdc8f216
font_02_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 16416 bytes
SHA-256: fc426b69702667494ea82ab449233930ad8540559082cfa60ce3940056e0aabb
font_03_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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