Malicious PDF — malware analysis report

Static analysis result for SHA-256 766c09277a12e57f…

MALICIOUS

PDF

70.8 KB Created: 2020-12-24 19:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c8cb7ee338ec466696ad18124d576e6 SHA-1: 9daf016c9b84c9cc34aab9a81b7bc91ca6fa28d9 SHA-256: 766c09277a12e57f97ab19e133da0a74c351ab5633e1614b8045cb1b2689216c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to online games and SEO, further supporting the lure. No scripts were extracted, but the presence of numerous external URLs points towards an attempt to redirect users to potentially harmful content.

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 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.
  • 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://traffnew.ru/strik?utm_term=best+online+games+free+minecraft PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fdf58f581602.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/farobeva_waneniti_zapomanube.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/lutonopuzuva_surotupuzuwobe.pdfIn PDF document text
    • https://digufotunu.weebly.com/uploads/1/3/4/2/134266503/marodi.pdfIn PDF document text
    • https://zajuzazoni.weebly.com/uploads/1/3/4/8/134891144/rarudimibasubugiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fcd79c3b9ec3.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/6987841.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/famita.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/2600134.pdfIn PDF document text
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/0c61367b7830d.pdfIn PDF document text
    • https://repenakexo.weebly.com/uploads/1/3/4/6/134600143/nuwedobigetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f93ca8dcf9ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f95e585df5ea.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/zawanopemo_kapibozikilere_potaf_jelezokisovod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 5252 bytes
SHA-256: b507280d9d5982b8e8e65f210d3f58a4e4185ba9bf0ffad5a23cfdc76e0d789f
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 10240 bytes
SHA-256: 274fe124a8c6f1b6912cc6f2777e7a03915b139b4d28b48b7aaead654fbc2f5a

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