Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ed1e908682d7b0…

MALICIOUS

PDF

76.3 KB Created: 2021-05-23 00:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 11d3643ce6dffe945d87c65732179e0c SHA-1: 213575f2ba974575a8dab73f2e1ba7963fe7cdc2 SHA-256: 23ed1e908682d7b0ac9675d72f60d0850b700f046f07f97485f3a8211051b6f3
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It contains numerous external links, including one to 'zajinet.ru' which appears to be a lure for downloading cracked software. The PDF structure and embedded links suggest it's part of a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=djay+pro+windows+10+full+crack+iso+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5feb946bc915d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_6053b06f812c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_604d704811528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_6007fb40ea941.pdfIn PDF document text
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/78226dff75df577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_605fd6b25c73f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_6036124f972d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456996/normal_5fe36f475bb7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_60010ebb85564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_604fe626811c7.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/pagodak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fd65bd769b50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fe432a6e4b2c.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/nomupoxokev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fca873c3a3bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_60072161e3210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_6059b0fa6a0e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fd091974ad76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fd12f6d9bacb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376404/normal_5fe0643e4791f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_604916472b37a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_6003bc3252d4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5676 bytes
SHA-256: 87838f98ed3897f423005a2f761ea3791de5062d248d0ae340a1c4247e1ed786
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10440 bytes
SHA-256: 15269d4f89829ebecd0fe879469bc5bf15e861e97c8e2d35b77d92d1983e6d1d

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