Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ac0f3cd1ff361…

MALICIOUS

PDF

68.5 KB Created: 2021-02-16 04:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd5df91454ced582767e3a1646464a3e SHA-1: ad7f61ed36ac77a738c4f4e547e528294e4144e0 SHA-256: 521ac0f3cd1ff3611d2668d398936dee7ecc5ee3d089377da7f4c9b84536380e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on disposable hosting, likely to obscure the final malicious destination.

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://seumenha.ru/wb?keyword=1970%20ford%20mustang%20mach%201%20428%20super%20cobra%20jet PDF link annotation
    • https://cdn.sqhk.co/jupuvonijor/hbjcfge/sebitamu.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/hieehf4/xadilize.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/cQGQdEq/50954725117.pdfIn PDF document text
    • http://onlyforyou.space/ejercicios_adjetivos_determinativos_1o_esos8y5j.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hjZ0EI5/50404471936.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/4948535091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_6028583788547.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/7Xjdkib/go_long_meaning_urban_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/7rujhgi/dog_runner_treadmill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_5fe3c60b53a21.pdfIn PDF document text
    • http://remontnatali.ru/free_autocad_floor_plan_dwgnnmb8.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/zukogi/video_off_website_firefox.pdfIn PDF document text
    • http://sawexelisam.epizy.com/zamujuvabevasi.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/75336039076.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/bruno_mars_songs_marry_you.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_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 6504 bytes
SHA-256: c92e8c1f21a88a960e59660eaf12818706abd3e61c616d96df35ae2d0bccb3a8
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10404 bytes
SHA-256: 923d6edd44c35c0e4c1619b7f01e08bbeb19d4aef3afd97f18ae14ed7ec2362f

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