Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ac59266823f1c9…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 04:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 16e639162fb845ca5e7271efbb9cfc5f SHA-1: 170effb7fbadf1eb4c0f28d53cedb4885a51c215 SHA-256: 81ac59266823f1c990cc372bedddb40ee4731dc65dcb7e41caaa5cc91c76805a
186 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a lure for recovery secrets or private keys. It also includes external URIs pointing to potentially malicious domains, suggesting an attempt to phish for sensitive information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://jacksth.ru/award?keyword=engineering+drawings+title+block PDF link annotation
    • http://natur-bio.space/tewesebavovaxivuxemorett3is4.pdfIn PDF document text
    • http://cybety.xyz/18254812542tunxo.pdfIn PDF document text
    • http://casser.xyz/casio_wave_ceptor_owners_manual5l158.pdfIn PDF document text
    • http://paypallsecurity.com/zawopamosexibemilhvyxp.pdfIn PDF document text
    • http://koolmaxt.online/76874890514yc9vj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5ff0993baa580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_60210e85c0fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_6032e3f03f12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5fe6be4b550c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fedcabb21823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382408/normal_5fcdcccf23a2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolekazejufu.rf.gd/btc_private_key_finder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/bypass_7._1_1.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/65103553755.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_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 5360 bytes
SHA-256: 8a9ef4f111d0dbdd316cf12f6b0c4def69e6f73ab6011db64d6216d2e13766d3
font_01_sfnt_off00011746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 10192 bytes
SHA-256: 602fb4b645bfd8969b242e434e231bda6b11f0073ff3bed34fc45424affbc791

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