Malicious PDF — malware analysis report

Static analysis result for SHA-256 240691c68acf80e9…

MALICIOUS

PDF

70.8 KB Created: 2021-02-12 22:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc4367fadd350d158fa00e54bb991bd4 SHA-1: 70201d5d2930b35b55ffe1b4101e64a194a495bc SHA-256: 240691c68acf80e993fd18cc60a950f1552146433f94c43346267737e819e299
146 Risk Score

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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, and the 'Callback phishing phone lure' heuristic strongly suggest a social engineering attack. While no scripts were extracted, the document's structure and URL patterns are consistent with phishing or scam attempts that rely on user interaction via phone calls or external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=pioneer+avh-p3200bt+bluetooth+audio+streaming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368788/normal_6020b6a2a6588.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/39046267866.pdfIn PDF document text
    • http://jobauthor.online/nobaxikubegunofejajelupawxvgg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fdde4236d8e0.pdfIn PDF document text
    • http://fefogumok.22web.org/alt_balaji_apk_for_mi_tv.pdfIn PDF document text
    • http://ttttrrrr.space/21826768584s6qh5.pdfIn PDF document text
    • http://mydenverneighborhoods.com/exploration_craft_3d_mod_apk_unlimited_moneys4np0.pdfIn PDF document text
    • http://8gusevshop.website/training_calendar_template_excel_free564au.pdfIn PDF document text
    • http://velixone.66ghz.com/friends_quiz_questions_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/16310038097.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/ffxiv_machinist_shadowbringers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/1928880981.pdfIn PDF document text
    • http://manutilo.epizy.com/car_games_2016_free.pdfIn PDF document text
    • http://tejugelomuw.rf.gd/animedroid_apk_2018.pdfIn PDF document text
    • http://valogaberel.rf.gd/35467513463.pdfIn PDF document text
    • http://keladosa.epizy.com/diabetic_retinopathy_screening_guidelines_scotland.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_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 6044 bytes
SHA-256: 8c15f275d028d1a0a6380c815b78ea4f1dea646bd274fef1008ba77f0ac26b23
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10804 bytes
SHA-256: 5f7821b2d06a33cd7e38ad165d20b45aa5f3c10e7467b50dc6347545813b2f9b

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