Malicious PDF — malware analysis report

Static analysis result for SHA-256 601f2058771ad4d1…

MALICIOUS

PDF

80.8 KB Created: 2021-05-10 21:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9ad420c23816a08fff263b4f2b408861 SHA-1: 266ef10ad9bee8aeb98df535a17dc648695984b0 SHA-256: 601f2058771ad4d1a43d90d541dbef14c974d9ebe0a07c53bf47693d49205626
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs, with one notable URL being https://bologen.ru/strik?utm_term=what+is+sweat+equity+when+building+a+home. The presence of a link farm suggests an attempt to direct users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=what+is+sweat+equity+when+building+a+home PDF link annotation
    • http://mebotus.mypressonline.com/job_cost_sheet_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fd63c36bb15b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_60212599d0282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5ffc7dd249677.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/99547740717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_601bd1845efdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5ff120752a7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_6030d20143e19.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/how_to_simplify_expressions_with_like_terms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60446249d3a1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5feba66fede8d.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://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_166077752f8c4358a61c9d54bf131125.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f603bb47a30e4eb59fd7b0c91e885e35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/mopavasudijuretelufuxi.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_99903d5a2f1341cfb294a6eed1073342.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_3a2896808bc34f559cd773aef6631737.pdf?index=trueIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_f6b6191da8af4c2ea811c44366a68f5c.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_6a2c2a9f6c384aec827f8a1f0e0151c9.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_92351f3ab3a04773818d6bee450b0e34.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_ac26c8e7f3074457a687fb57cf815dbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/aia_insurance_application_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5500 bytes
SHA-256: b11b5352a78ebcab630dcb59565789bf1d696be11f63498af09cfde87fa644c7
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 11028 bytes
SHA-256: aeaddf572f1caca690bdc45b52f274336508fb91db0607be89e372fa7a7a2f69
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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