Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ed74545ba83d57…

MALICIOUS

PDF

64.6 KB Created: 2021-02-16 06:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9bccd23e0251c649ba6fa0eb54725d8f SHA-1: 1b4ce490be513c5a362e046a529ec23124b7a3f2 SHA-256: 51ed74545ba83d5799a5f573575bf9162985db3d200c49ccdf0992e2ac3cbcf7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to deliver malicious content.

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://seumenha.ru/123?utm_term=how+to+program+old+raynor+garage+door+opener PDF link annotation
    • https://cdn.sqhk.co/jevamivuvugi/znijiay/digedapelijigawimije.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/3H0W3gd/xuxutegopewumitaladako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_6003eff429c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_5fe9773283c08.pdfIn PDF document text
    • http://kyhni.site/where_do_you_get_bubble_tea_near_medvic4.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/titibusekujefaxubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5feff95f5436f.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/bWgcQJm/clash_of_generals_3d_game_download_for_android.pdfIn PDF document text
    • http://heleogose.online/gimuvijugikusutesutegaraprwkj.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/cuiiwia/brother_speed_rivals.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/dWgeHig/pofodiji.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/IjesjvI/ultimate_bubble_tea_apparel.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/giZhhCL/fx_racer_premium_apk.pdfIn PDF document text
    • http://wwnews.site/34020717671suox7.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/tfidhUZ/linen_pants_plus_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec182dec012.pdfIn PDF document text
    • http://firstdoctor.xyz/football_games_for_android_apkvavb0.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/e1564b97da89.pdfIn PDF document text
    • http://www.coventryfirst.co.uk/data/images/new_jaguar_logo__2_.jpgIn 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_off0000c2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A3 5256 bytes
SHA-256: 2cfbd719e08b8ae860e7e0cd936707261dda0691fb976c6dafe853e01b361983
font_01_sfnt_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 9532 bytes
SHA-256: 1416ba87eb586b1169d23012e8bf5dd3c17f3a625d1760693de1b228b6ef0356

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