Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fff69d73b75dbda…

MALICIOUS

PDF

75.6 KB Created: 2021-02-12 18:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1ab74a62ca1a5e3c9e290d484879c6a SHA-1: 86e066f6d0040366dabc7f869a1f71c7bb22d97d SHA-256: 0fff69d73b75dbdadcb8da0838536020795a5132098702e54a063896d8432d58
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=inspector%20general%20report%20on%20stellar%20wind%20unredacted PDF link annotation
    • https://cdn.sqhk.co/zotipimesaza/hjZ8Sdy/63152492163.pdfIn PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/46cae9a7.pdfIn PDF document text
    • http://mazafaka69pussy.online/shanta_bai_song_ringtone_freeepvq7.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/9elhDig/fun_goal_tracker.pdfIn PDF document text
    • https://tobemokopa.weebly.com/uploads/1/3/0/7/130776516/bagenoxatosav.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/IieijhO/jetenizixojemin.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/750601.pdfIn PDF document text
    • http://train-home.ru/wirusajapopovoxatujelexarcnuo.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/wunugix-fotirifexutojel-wefavibas.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/hMhjhh1/gun_fiend_gameplay.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/cc10c28375.pdfIn PDF document text
    • http://mscredit.info/dikudamikimixananiduvarc4wz8.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/jolunenafobuw/lafiximusowalimevow.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/99219064105.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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 5268 bytes
SHA-256: 603e7b3f96c9e2f1fe87495ecedfd37826b19689b22abc5dcc23ac8c54b62256
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 11044 bytes
SHA-256: 6364ddf4ff27c0b76f86d7f0a4674dca2a57e8934be08abf205e5a51fa816bac

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