Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dae247a3d4b633…

MALICIOUS

PDF

68.6 KB Created: 2021-04-02 13:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5b4a5499c54f330bf6bfc94f65d4aa5d SHA-1: 9d02c56c574d02f621de8ee55141792309eb0bbe SHA-256: 87dae247a3d4b633d416b4a19b0a3af470ceb859fc706d22f80b71e3944d06f0
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://soxebez.ru/123?utm_term=cantonment+act+1924+pdf PDF link annotation
    • https://cdn.sqhk.co/gofejenizew/cieia4s/37959558731.pdfIn PDF document text
    • http://confirmationhelpcenter.com/lincoln_electric_ac-225_stick_welder_manualkyq2x.pdfIn PDF document text
    • http://maska-respirator.com/information_security_policy_document_structurex56xh.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/7if8Gjc/luvajeleki.pdfIn PDF document text
    • https://cdn.sqhk.co/firataxoworo/h4hiPib/invitation_birthday_template_word.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/iQygfxn/aiming_to_become_a_lady_knight.pdfIn PDF document text
    • http://5dradio.ru/92048749698my6kb.pdfIn PDF document text
    • http://life50it.pro/how_to_view_bunker_hill_security_cameras_on_iphonew7f5f.pdfIn PDF document text
    • http://obuv-kozha.ru/51318642052b9psp.pdfIn PDF document text
    • http://terugate.mypressonline.com/arabian_nights_aladdin_sheet_music.pdfIn PDF document text
    • http://top-agent.ru/fixufufojusupafitux8nyf1.pdfIn PDF document text
    • http://pupunorip.getenjoyment.net/flat_belly_diet_book.pdfIn PDF document text
    • http://frukt.space/conversion_of_file_to_ms_word2b0tg.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/xomalidikefedavevuzomap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_013ba7eb996b44fab8c5ea89dec0a43b.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_efe307893a6745658db8e4de7c87d2ca.pdf?index=trueIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_8c0020da0f884ff9a2f97d68b3688f01.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_5a156d80f4a74f63bd761abd8333d246.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_4f62f12fbb0742658c445c6eb6eb4e8f.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ee6d0a3280f44b31b543703663aed86d.pdf?index=trueIn 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_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 5328 bytes
SHA-256: 85ffbf2380b8f4ff06f0f5417f116424e10aeb1d64ccd30ccf92e2a38200ba2f
font_01_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 10472 bytes
SHA-256: 38f864c3bd65eab7ef5c5efad615b1c8df3160d9e23aeed33fbaee7c3908bcdb