Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf59bb07e9b8540…

MALICIOUS

PDF

86.1 KB Created: 2021-04-08 06:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a21a083f6622e30633d0e412f3007765 SHA-1: 104f54b8b1708fc04be6597771131a6e53e091b9 SHA-256: 3bf59bb07e9b8540fa4a09bb51593af3e225d33c4b1012785f4d9b60250c53c9
186 Risk Score

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 0.9994

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://xajibur.ru/strik?utm_term=how+to+cancel+lumin+subscription PDF link annotation
    • http://vbnmcxz.xyz/collins_english_grammar_and_composition_7ldwdq.pdfIn PDF document text
    • http://technodom11.com/28319070882fmupx.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/5084492.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/2d61f1abbf.pdfIn PDF document text
    • http://crubr.space/accounting_principles_13thct7vx.pdfIn PDF document text
    • http://gaydating.world/the_big_easy_oil-less_turkey_fryer_parts03pl2.pdfIn PDF document text
    • http://olymp-trade.top/did_jacob_kill_the_boy_in_defending_jacobfuzg5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460708/normal_5fef63ef138e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_60421b9cdc144.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/modern_chemistry_chapter_1_study_guivwwuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5ffe14bd74234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_606e2dc84ea00.pdfIn PDF document text
    • http://doordash.fun/homologous_structures_mammalian_forelimbs_worksheet_answers0egji.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/6766c1ea4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_to_descale_nespresso_delonghi_lattissima_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/90347406487.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_41a2384d1f564e74ae17d6f3777cfa5c.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_0a7a2857994b40d49abcc84130396b14.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_3b60c8881d63486f88a73d350bfd5700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/airtel_money_adder_apk.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_1b949893b77f454eb76dcada86dca331.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
    • 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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5272 bytes
SHA-256: 495d0228c3d6ba7281c867ef517e8afbab51bbfa5ebc3e912b91a838da8780c1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 9372 bytes
SHA-256: 0f4a66270a2528149a8e145e1e31ca7dec784be930ee495f96b354b59bd04945
font_02_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 11508 bytes
SHA-256: bcc3b9b8fe285411e3d04f02881f53f69876bc264cc77d4fe988b0f112da356e
font_03_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 16548 bytes
SHA-256: 9a3bf1d937ce98808f278d069e1a65e7fcab02ef365c87ff40d42b661913c529