Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ec32433bfaa77d…

MALICIOUS

PDF

78.9 KB Created: 2021-04-12 13:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc91bab56f88b8db13c85cf099d1e3d SHA-1: 284aea3afd7022d5553fa0b060b0e99f443f73e0 SHA-256: d2ec32433bfaa77dcd26fc9b34d9a9c22381afb8172f2d5d6324fb4ee397c985
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://resalured.ru/strik?utm_term=wahl+clipper+oil+how+to+use
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6031172dce2b4.pdf
    • https://valowitezud.weebly.com/uploads/1/3/5/9/135993777/sadegesadanoxew.pdf
    • http://badge-verification-center.com/cricket_game_information_downloadj3kns.pdf
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/1753485.pdf
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/9488245.pdf
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ff543c3d023b.pdf
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/gipiximirote.pdf
    • http://marketop.club/acceleration_practice_problems_with_answersclhto.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_600edcf6edbd7.pdf
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/xifalebekewut.pdf
    • http://clipshd.design/90742381388vsex4.pdf
    • http://chambrehub.xyz/xejexodajir5f9ot.pdf
    • https://magalezofutik.weebly.com/uploads/1/3/4/5/134599277/b16c21b5fe.pdf
    • https://cdn-cms.f-static.net/uploads/4418567/normal_60622a244b92f.pdf
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/e6e301caa.pdf
    • http://euroshopme.site/how_can_i_strength_train_at_home3e7pc.pdf
    • https://cdn-cms.f-static.net/uploads/4454550/normal_602834cb7d433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxivogedewilu/29257168907.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/faxipuwonirixododilifu.pdf
    • https://s3.amazonaws.com/vexosafugunu/jubijanuxizuzot.pdf
    • https://s3.amazonaws.com/venunamazozuzo/puzezusow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e6.bin
508870add136a9a30736db3f4e29f484da7e6b053f5f27b9998c62b7a3309836		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 5128 bytes
font_01_sfnt_off00010968.bin
fd29101e0cf7a252819f97761c690291be3d63a8b0a56436dac6af5d3fdf73e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10972 bytes

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