Malicious PDF — malware analysis report

Static analysis result for SHA-256 718994e8361ac0d5…

MALICIOUS

PDF

67.5 KB Created: 2021-04-01 06:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4f47c431b92004ff66bfd716a640a395 SHA-1: c4816815b171b895dbd55f9c40182a33de80e590 SHA-256: 718994e8361ac0d5bac653500db85188df576be5019c28e4e11d8a9e4a27934c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/strik?utm_term=sears+garage+door+fix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405440/normal_6030233797f75.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/qejgajd/truck_racing_pc_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/f1Y2z82/39352522498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6026856b6d892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_601aaa1849e8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5ffc95dd5ddb4.pdfIn PDF document text
    • https://cdn.sqhk.co/pubabolab/dZSPL2Z/fixodefinulububif.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/hfRfSt1/herpes_simplex_2_treatment_over_the_counter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6013a8d46c694.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/ijUu9tT/basketball_hoop_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/BjcoibY/final_rally_extreme_car_racing_mod_apk.pdfIn PDF document text
    • http://heartcenteredequestrian.com/14259755922ygu33.pdfIn PDF document text
    • http://blancop.xyz/33475283260f8q2n.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/9geaz6G/warhammer_quest_2_the_end_times_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_601aee7f550aa.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_0396984a091c4d5aa5785f264d3a3ea1.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_eae70f9b40914eed81f61eb4380d2fd8.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_02725aa924684b89bba39b5a3b0471c1.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_57f0e18fb98f4bdb85ef384c0e295df4.pdf?index=trueIn 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_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 5212 bytes
SHA-256: 5fabb1365e2a1725c2017d66a1b90ec1f38b1d83c3e24a1f7bafba32f88ec2e2
font_01_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 9596 bytes
SHA-256: b3f1d89379ca9ec3b3955aec38b41617f516b215015049e10a006b1f3d10e672

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