Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1af8712ba12cce4…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 20:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0971451d668ad674e577256a272933e4 SHA-1: 0a03ca2dc882f2258cac9422bf709062280b00e1 SHA-256: d1af8712ba12cce4ebe11da8d533bae0d1a90f135da31b2cdf29910a26298c88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=brooklyn+brew+shop+instructions+afternoon+wheat PDF link annotation
    • http://lianhua.life/second_hand_portable_classrooms_for_sale1j9ke.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/2006_bmw_330i_valve_cover_torque_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/qiejfV7/struckd_3d_game_creator_app_download.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/pevovubedadilewewekij11w3.pdfIn PDF document text
    • http://mkuu.club/counter_strike_1.6_cd_key_ifresihmg6q.pdfIn PDF document text
    • https://cdn.sqhk.co/sepolulegaba/iegcpPY/tezelitipakanemozetula.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/6aba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_600c3dace41ab.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/kuwezaxuboga.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/temivixobokupilobazab.pdfIn PDF document text
    • http://b0xberry.online/duden_die_grammatikgihn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fd62b82476e4.pdfIn PDF document text
    • https://mitumusifunezu.weebly.com/uploads/1/3/5/3/135316179/7813361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_5fdd30ab8fcee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_6034f462bc50c.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/VtlgeHb/kuzesumogijevulivaguk.pdfIn PDF document text
    • http://timurberg.ru/gexonifamezarbm2ul.pdfIn PDF document text
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/lagetelutelebipogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fc7d3303aefb.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/5775744.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/lukalopekoxaponadesi.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hcidjec/overkill_3_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipanizi.myartsonline.com/naxorazupezo.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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 5552 bytes
SHA-256: d04510959c0314e52c96eb4dddcf4337203b1c59e4c86f2d188b1fe2226cd458
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10872 bytes
SHA-256: 170e94cf453fc452b31833538d6e81ad9e7a15ff336dc4d00623ed452ab3c2ae

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