Malicious PDF — malware analysis report

Static analysis result for SHA-256 201665581c37f3da…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 19:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9d6dc22b880eb5eaa70922fd2f1777f1 SHA-1: 42e2ab4f0a5417f73b88b6d0ba78fb18b4bf90ea SHA-256: 201665581c37f3dad308d8b533f0eb08e5f5233a54e06c3b456fa99eb0c66ae7
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware delivery. The document body, though heavily obfuscated, contains references to a '2016 jeep grand cherokee srt owner's manual', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=2016+jeep+grand+cherokee+srt+owner%2527s+manual In PDF document text
    • https://cdn.sqhk.co/samofetob/chaROhf/business_card_calendar_template_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcb5b589ffa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fe15b4a16a99.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/iacH6SZ/wubakisidiradawiloku.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/novelaxadajog.pdfIn PDF document text
    • http://xopiredat.22web.org/lalukaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5fcee2510ddb6.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/rGPFgjr/97801460968.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/baxIjeb/star_trek_fleet_command_missions_discovery.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ejfjbiW/38464367886.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/literatura_baroku.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/calculations_in_chemistry_dahm_2nd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_602062880bda9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_ee66d6d72230470e927c988189aa859e.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_388652057db84b068a94d43b77e6ea4b.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_4d69b99885b7429a95d3d2d60b214d79.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_a1698a79f4b24a99acc16a56815301f3.pdf?index=trueIn PDF document text
    • http://lewomunenuvi.myartsonline.com/descriptive_writing_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/plt_m50_pairing.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/4736632715.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/what_is_ux_design_definition.pdfIn PDF document text
    • http://pafemex.rf.gd/ganob.pdfIn PDF document text
    • http://zukizibukuxupir.epizy.com/97407346466.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/3598006933.pdfIn PDF document text
    • http://mekazejirorarad.epizy.com/69119418719.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 6136 bytes
SHA-256: 8f5690e8d2b0ce63ca04e25e169b5465932d6ec96401567482c2a5e01aac96d1
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 10660 bytes
SHA-256: 10fa9c6eaff8abf5ac5e484d989b1f64df3701b31d03d20afa689c71ac6b4629