Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf9155b6660ed35…

MALICIOUS

PDF

74.0 KB Created: 2021-06-09 15:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26f31821c11946a9a3dda1f22bcc6523 SHA-1: 3c1509e862f13bfb31b473774526870a0d45a013 SHA-256: 4bf9155b6660ed3597f1bbd9758c5d4a28f5e5b6a228ca9214135cf9cb132f0b
146 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 callback phishing lure, prompting users to call a phone number. The embedded URL points to a domain associated with phishing and shortcut maker tools. ClamAV detection and ML classification strongly suggest malicious intent, likely related to social engineering tactics to defraud users.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/pbw?utm_term=shortcut+maker+frp+bypass PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fff45c0c23d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_60b843c7b1db2.pdfIn PDF document text
    • https://powipasime.weebly.com/uploads/1/3/4/7/134725879/8375319.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/7ec09bde52a91.pdfIn PDF document text
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/tuferafaguru-kolifaberazefu-mitavep-nekuvedufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_600a7f4284eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_604ce3c361129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b769b0-bc32-489f-84b7-89175467a9f2/loduxanotibewidezew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dced7c5-ceca-444c-b544-27624428af09/69034121109.pdfIn PDF document text
    • http://sixuditar.pbworks.com/w/file/fetch/144711051/59792735989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a244d4-e375-490e-9683-eec454789f2b/how_to_put_photive_speaker_in_pairing_mode.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144945729/wavarofaxak.pdfIn PDF document text
    • http://lowigamivux.pbworks.com/f/23279968047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd17a3e2-f8b1-4102-8a3f-7fb81a64eb58/tipo_de_aceite_para_bombas_sumergibles.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144883170/gojisigojebo.pdfIn PDF document text
    • http://simaduwu.pbworks.com/w/file/fetch/144841932/tarenupedofizisefetak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4eac53-83e1-415a-94cf-8e2777422c5a/89442961930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e62d8f3-3963-4f75-83fe-566fb7e63f12/97_polaris_sportsman_400_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf62ed3-5ff5-4103-9dc4-f20b9b6f71e4/how_do_i_get_my_keurig_to_turn_on.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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 5632 bytes
SHA-256: e9262634634becfa71b615372fe42100ecbba729d1de9e464103658618a701be
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 12264 bytes
SHA-256: ca5e8ca26b737cfe2f4c39c308097e09b3cfa984e797052f7a666cd18ee5e368

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