Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59fd24a815084b5…

MALICIOUS

PDF

68.8 KB Created: 2020-11-11 20:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1377e9f0db14a8ac9ded3f4e3495de6c SHA-1: 14b953cc51522c6cc3ec1b808a48c8433c2dae0f SHA-256: e59fd24a815084b5980aab4fe6994855cce8839e8173ddff3f9c0d447497025a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the link farm behavior. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=leupold+mojave+pro+guide+hd+8x42
    • https://vezidinudavad.weebly.com/uploads/1/3/4/4/134481570/872ad7.pdf
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/8a1c3.pdf
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/tumudu.pdf
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/nugulugodufow.pdf
    • https://jukawowirorab.weebly.com/uploads/1/3/4/6/134662443/6345746.pdf
    • https://tuzatorigipixaz.weebly.com/uploads/1/3/4/3/134321964/basobeso_lunarawofo.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5d6f2da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30b94374-0e9b-4563-bff2-eb7fb112dd22/50133192683.pdf
    • https://uploads.strikinglycdn.com/files/80f905ba-0c9f-4aad-9265-94c08f12d155/86501533237.pdf
    • https://s3.amazonaws.com/xakapudakadu/jonakemipoxitoxadisulup.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/icom_id_5100_manual.pdf
    • https://uploads.strikinglycdn.com/files/22aafae7-baad-4632-8ca7-b715791ec57f/corrigC3A9_crpe_franC3A7ais_2016.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_off0000cb0b.bin
d1621ff7b0c65c13ed4456da7350774ae3e233c9ec06e62cb436d4bfaf378369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 5756 bytes
font_01_sfnt_off0000de8e.bin
5929d556cc98c72b955376c9490402b9299caae509e1402621ad36a94bd68445		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 12076 bytes

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