Malicious PDF — malware analysis report

Static analysis result for SHA-256 6158bfb364d6315b…

MALICIOUS

PDF

72.3 KB Created: 2021-02-21 13:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3f9f13a4268ddf708a27dc905b64f9fd SHA-1: 31b270a58101553384c5eec57c54564ddc587f76 SHA-256: 6158bfb364d6315b04f8d5ff252e37e5e1622cfb1d9f54aedf0e8f8f8895ebd5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be related to car parts, likely a lure to direct users to malicious sites.

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 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/strik?utm_term=dodge+charger+rt+spoiler+installation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470678/normal_602b292818eb2.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/jusizake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fec5a8d686fa.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/kojibubokugusarefa.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/bgijhgj/download_web_browser_apk.pdfIn PDF document text
    • https://sumokexopusoval.weebly.com/uploads/1/3/1/3/131378975/fb72b27009831e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5fe251a6cbab5.pdfIn PDF document text
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/dee8e190e41.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/rodafunona_botumofutijive.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/XjbRgfr/65573482491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fd266f3a365c.pdfIn PDF document text
    • http://50offshop.info/katun_bangla_2018_video_mp4lofg7xmb.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/8pisAXl/grow_idle_archer_firing_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_6026474948886.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/ehghhgj/69167326859.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/djdibK2/zewifuvexipefajupuxena.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/tonemakopinibem/adaalat_episode_1.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 5332 bytes
SHA-256: 0fcc34d8cef0cd4426b913575696147effcd206f049a1b0ce2fced04824bdc82
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 10952 bytes
SHA-256: c2382545eaf56e1fdf22c4b2c06938f1bc272f95b00af65133c751c52872f6e8

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