Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94dc9b2e38706e7…

MALICIOUS

PDF

73.4 KB Created: 2021-03-02 11:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 74eafeefb8de5d310b684add28b44cb7 SHA-1: 3f375a0a093c3d2d653d2a22c0afa43765b5b9a7 SHA-256: f94dc9b2e38706e7fa41c05d14005a1db4e7da3a602608d1211e9268bc909c3a
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, exhibiting characteristics of a link farm. It contains numerous external URLs, with a significant number pointing to disposable hosting services, suggesting an attempt to obscure the ultimate destination. The primary purpose appears to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

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://lozipotod.ru/123?utm_term=letra+en+espa%25C3%25B1ol+stressed+out+twenty+one+pilots PDF link annotation
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/75ecbd.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/allan_mckay_fireball_free_downloadks9ru.pdfIn PDF document text
    • http://vukabuv.22web.org/breach_of_employment_contract_letter_template.pdfIn PDF document text
    • https://gasatuba.weebly.com/uploads/1/3/4/5/134596028/3be1c4da.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/8916112.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/9218963.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/jokenowulogaberinoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374984/normal_5fc960be28251.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jdfPhb4/vemeravilojesevig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fdef9f66504b.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/njgGETb/declaration_of_war_december_8_1941.pdfIn PDF document text
    • http://podarokinsta.online/jogobepenosazimiwesimikev0ocv.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 5300 bytes
SHA-256: 61ebc1a8e6de4698a897bc5f8eb38af2f275588d66360740f9894c63c5e3950f
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10168 bytes
SHA-256: 41ff5be1f8be2f1a68e698ee7a339e2bb93775c6b3e2f14d36fbbb3d22900447

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