Malicious PDF — malware analysis report

Static analysis result for SHA-256 9784ba1e019d53ee…

MALICIOUS

PDF

70.6 KB Created: 2021-02-22 18:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 40a9495561da826d5d614b4d9c1a9a4c SHA-1: a1469f661bed076dea5c3a3e015f4b368d762f05 SHA-256: 9784ba1e019d53ee2179801acc092a5e47bb644ab5d6d81967b4357158720c0f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1059.007 JavaScript

The PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a credential phishing lure. It directs users to external URLs, one of which is associated with a link farm on disposable hosting, suggesting an attempt to harvest credentials or abuse MFA processes. The document body, though heavily obfuscated, contains metadata consistent with PDF generation tools, but no direct script execution was observed.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/123?utm_term=how+to+tell+military+rank+by+uniform PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fefd249932c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_602c6e9daccec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368732/normal_5fed2cb2f12c1.pdfIn PDF document text
    • http://opendouche.xyz/2182542158077ocg.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/f9dkFvx/microsoft_authenticator_iphone_no_qr_code.pdfIn PDF document text
    • http://lemopebese.66ghz.com/victoria_2_uncivilized_nation_guide.pdfIn PDF document text
    • http://memexeti.66ghz.com/dekisoxex.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/hjeYtKx/zakatilikuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5fecaf350c4fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387420/normal_5fec543b27b29.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/FRmiigf/bipopowulojo.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/FhgvaQQ/duwojiferubadunawodikot.pdfIn PDF document text
    • https://cdn.sqhk.co/vopiruwikil/Dgchdgg/offroad_outlaws_download_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukudapig.epizy.com/monetetupubet.pdfIn PDF document text
    • http://beluguliwiwe.epizy.com/lojujizifenutot.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5092 bytes
SHA-256: f0a566d3054a35355e18e9845e439b18213005536cb4f45c30836c3f7414bcf7
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 10548 bytes
SHA-256: 383d4560ecd860ca17150e53aabcb97b8f128dfe8cefdff699183189a2955a7f

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