Malicious PDF — malware analysis report

Static analysis result for SHA-256 738935727e4e2e25…

MALICIOUS

PDF

78.2 KB Created: 2021-05-06 08:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 109fde4afc294db9d2330b0af1a0cce1 SHA-1: c158486560e7109d125e1df79a0109dc1c3f66a1 SHA-256: 738935727e4e2e250da67619241d1cd4db8345cfa4eada51aad01989474c61ce
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One embedded URL, https://kuzutuzo.ru/strik?utm_term=which+graco+tip+to+use+for+trim, is particularly suspicious. The document body is heavily obfuscated and unreadable, but the heuristics indicate a deliberate attempt to create a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=which+graco+tip+to+use+for+trim PDF link annotation
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/bufezujub-lafux-kajoninedexiloz-venot.pdfIn PDF document text
    • http://ductsunlimitedins.com/what_are_the_five_books_of_wisdom_in_the_old_testamentsmpji.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/8f3eb679.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/ghdwhis/chicken_broth_gone_bad.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • http://scoretdho.best/vibigamidodesalefaxapqjdn.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/xexidazuzid.pdfIn PDF document text
    • https://joralonu.weebly.com/uploads/1/3/1/6/131607047/6144226.pdfIn PDF document text
    • http://eferevole.com/canon_pixma_mx300_scanner_driverxggiu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_6037ab044b7a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_604e48b0d3ed6.pdfIn PDF document text
    • http://idealica-official-it.website/asus_rt-68u_firmware_updatedc06h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5aee69-a726-44e5-992d-7e2a9eed534f/what_kind_of_ammo_does_a_taurus_g2c_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10717fbc-f40b-4578-9ee5-480c5cddd7ba/michel_foucaults_theory_of_panoptic_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82f9399-9556-434b-b3e6-901a2dbc0d63/94060027310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c9c263-4ce6-4922-926c-3e6dd2521801/what_is_in_boston_market_creamed_spinach.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_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 5408 bytes
SHA-256: 3345488a927e3ee01cf91bddd5d5d4eae82215f987c747df91a17843c57f6951
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 11264 bytes
SHA-256: 075254bcbbd3b5c3adc71a4581bedc964f7daf8c0054e166753ee8a8181389b7

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