Malicious PDF — malware analysis report

Static analysis result for SHA-256 f734305cbcda7474…

MALICIOUS

PDF

72.3 KB Created: 2021-02-02 15:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5c11620d1e4315ab72f54c80db90d285 SHA-1: d71b46cd4ce0770b3ee1478b7502cd321db8c65a SHA-256: f734305cbcda7474d73d3eed0072fc13ddfcc5ce27b87712dde899d9397baf7c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=bear+river+reservoir+ohv+trails PDF link annotation
    • http://idealica-italiaufficiale.site/gesture_lock_screen_mod_apkvf09g.pdfIn PDF document text
    • http://titoto.xyz/kizulesapirid3iri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_5fe6555f3a748.pdfIn PDF document text
    • http://rigizaba.iblogger.org/t260xw02_vk.pdfIn PDF document text
    • https://cdn.sqhk.co/bujedebi/hAmAZgd/46197382509.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/lojgohc/sojusenojez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456389/normal_5fefba6bd3832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_5fe68b818a455.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/dhBgfm1/bandai_namco_twitter_dragon_ball_fighterz.pdfIn PDF document text
    • http://prizinsta.online/teoria_general_de_sistemas_librotves6.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/hgxidja/86803262083.pdfIn PDF document text
    • http://sportita.fun/smart_brain_games_and_logic_puzzles_mod_apkqf20o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421224/normal_5fc77349b5c85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voxinuxo.epizy.com/photo_editing_background_image.pdfIn PDF document text
    • http://pewijaxenutudum.rf.gd/alone_wallpaper_images.pdfIn PDF document text
    • http://xutirekivob.rf.gd/sidobe.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/xoxarisovinisajodud.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 4884 bytes
SHA-256: 669cb9f1242aef8dc59e9763b64f167426a70b1443acee4a4662322527c06762
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 10300 bytes
SHA-256: dd5e47cb343ff040876c9b1458b6bf68d5abb49a54739989241286d6d54a4aa5

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