Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc6442aca486208…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 04:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2a50a6764c87c68adab4ab8735e1d510 SHA-1: 3ec9c279b3af78701d67465b2912cd96b56be925 SHA-256: ddc6442aca4862082aa1ff066d2157ff5475068bdf40aceb367c53eac70ddb20
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm intended to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/wix?keyword=avantree+bluetooth+transmitter+pairing PDF link annotation
    • http://good-production18.site/structure_of_plant_virusesjjo9m.pdfIn PDF document text
    • https://nelizozab.weebly.com/uploads/1/3/0/8/130874358/gitovidaz.pdfIn PDF document text
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/4214656.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/a9c43.pdfIn PDF document text
    • http://ketrovk.xyz/free_zombie_survival_games_multiplayer22v35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_6002eafe499a6.pdfIn PDF document text
    • https://xopilinunerixaw.weebly.com/uploads/1/3/1/3/131380618/bbe2c82ac320d.pdfIn PDF document text
    • http://trastenmyqort.online/begodekej4p0h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fde14aba051b.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/gonibewope_navevumomiv_vokajazafob_dufavupi.pdfIn PDF document text
    • http://voztrans.ru/81455637888goxa7.pdfIn PDF document text
    • http://milesnires.xyz/voice_assistant_off4l09d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_5fe03e3ab074e.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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 5424 bytes
SHA-256: 3cbbf287ce5096e0bfe7a86ef590eda74e5bc60e147e0e3c1ad46fc0348f9bf2
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 10368 bytes
SHA-256: efbaade0d9868dc090a944196dfb37fc3d509571621c66c4dfcc09e9c2259f1e

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