Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c037080808d63f…

MALICIOUS

PDF

76.8 KB Created: 2021-01-26 11:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: be4c6f7479d521550a5a1288a269f0e2 SHA-1: 3257e2c6b6530205cd0ff4919d2f2041ddf77dae SHA-256: 11c037080808d63fa58427b0c855846cd3a6894d2ceee507957e2f69fa837305
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to 'trafffe.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=toyota+avensis+2008+owners+manual PDF link annotation
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/mososaful_loberu.pdfIn PDF document text
    • http://noxivivixuza.22web.org/ipmn_fukuoka_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408983/normal_5feff90ad44ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fd0d97b01732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_600b39cbce5d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5ff7573239474.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/4481535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fe94a0b8328f.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/kadelemeg-pukuw-dukusofirevaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fde0dca94c06.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/aadhaar_status_ing.pdfIn PDF document text
    • http://mazafaka69pussy.online/swing_design_10_couponntsdd.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/suvodiruxexupawos.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/ritoma/rorupupiremizixovuxikinev.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/cv_template_2_pages_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/werewolf_of_london_piano_sheet_music.pdfIn PDF document text
    • http://mepojijolotezud.rf.gd/76497137877.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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 5500 bytes
SHA-256: 90afbc46ce6384479ba128204da68c75dc35cf7dad1bd40421ebfeb0b938ef9b
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 12964 bytes
SHA-256: c3fd095a168055e67649fad63e06d6ee53a09ab6e88ed3230ebede07ab426c90

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