Malicious PDF — malware analysis report

Static analysis result for SHA-256 17969bf651df80de…

MALICIOUS

PDF

70.0 KB Created: 2021-01-14 22:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d6d8611e9321c8898584928272aa21bc SHA-1: dc194b0436ac7b159b146da6ab07bbdd6549d53a SHA-256: 17969bf651df80de03c006675258bdd973ce67b6b0f9cd7e21c257f4ec4a2ef9
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, aiming to trick the user into calling a fraudulent number. The presence of external URIs, particularly one pointing to 'trafffe.ru', further supports the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=ma+teachers+retirement+payment+schedule PDF link annotation
    • https://site-1173456.mozfiles.com/files/1173456/magic_wand_company_sparks_nv.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/ghghQ6p/chiq_retro_fridge_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_5fab8112ebe63.pdfIn PDF document text
    • https://site-1168077.mozfiles.com/files/1168077/tojutose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_5fc12c21ca1d3.pdfIn PDF document text
    • https://site-1172855.mozfiles.com/files/1172855/minijamijimudamimerid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5ff563b75972b.pdfIn PDF document text
    • https://site-1177600.mozfiles.com/files/1177600/red_and_blue_states_map_2020_by_county.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/iddhePd/riders_republic_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd3224854151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kudefem/vaxovifilasasunawawadan.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/52433248123.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73E 5192 bytes
SHA-256: 0c31a271f89d029aa8c756ee0851ebd2165e7c7099e4126e0d9e208aa7507716
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 10672 bytes
SHA-256: 5d289b47d4294e793c88585a94fc66ec1f0cf783b6c4b08e5fe2d31fddfbee40
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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