Malicious PDF — malware analysis report

Static analysis result for SHA-256 3777e5e01d011fb1…

MALICIOUS

PDF

72.2 KB Created: 2021-03-23 19:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2650cb2b99106dafeeb34df634d998f4 SHA-1: 7c567b28b1f62e2e836fdb159d82e8de786c8ab8 SHA-256: 3777e5e01d011fb1f28e39c3d0c41d93277b33df774926e59726040ead583ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file that contains numerous embedded URLs pointing to various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/award?keyword=loeve+probability+theory+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375197/normal_6047a62c354fa.pdfIn PDF document text
    • http://klossheff.xyz/gerda_lerner_the_creation_of_patriarchyuwl37.pdfIn PDF document text
    • http://ifeelgood.club/643644376734x0kg.pdfIn PDF document text
    • http://dresdenpharma.ru/human_skull_anatomy_activity_answer_keytoj5n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fc86794c902e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5ff20a20953af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_603ed938b6735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6059eb222939f.pdfIn PDF document text
    • http://tryplafond.xyz/android_camera_preview_fit_screen837t1.pdfIn PDF document text
    • http://store50off.info/antecedentes_historicos_de_la_diabetesga7eh.pdfIn PDF document text
    • http://bachanalytics.com/ar_verb_conjugation_spanish_worksheetjtaa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495050/normal_5fd8e2fdec05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_603592940492a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5ffbe73280736.pdfIn PDF document text
    • http://svarka-aurora.online/wayne_dalton_torquemaster_plus_partswwdiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fca2f00c3210.pdfIn PDF document text
    • http://laulu-go.ru/gizazanoweg2gm7.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/dbjiChh/xisadufibuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5fc5d89530b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_603d29813a532.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5196 bytes
SHA-256: a42cca5487da2eea6002b32d57648b87f8e53bc7a75f8a8d4f594aa27f6d55a5
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 11044 bytes
SHA-256: 14cf07f1db24adc4b1bf92d51165aed3d199313195eaa3af255a80c15ac2f206

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