Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee933e21463f3e4…

MALICIOUS

PDF

70.7 KB Created: 2021-04-08 09:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ae4daf9ace8d550ebd3f3843bc26c98 SHA-1: 917c6fdf38b9cb7bec34a531e0690f7a853b3981 SHA-256: 6ee933e21463f3e48f2086078eccc935843f036d835f371e7e38b7dc9a835987
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains multiple external URIs, including one that appears to be a redirector with a UTM term, suggesting a phishing or malware delivery attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for malicious links. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/123?utm_term=balancing+redox+reactions+worksheet+2 PDF link annotation
    • http://wildber.store/141332730606bt76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_5fdbd177c82de.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/fegolodufe.pdfIn PDF document text
    • http://perevod-card2card24.site/world_of_darkness_collectionyxzjg.pdfIn PDF document text
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/db62f1bb8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_604b2df13f4fc.pdfIn PDF document text
    • http://remont-kholodilnikov.website/extech_stopwatch_instructionssnrgh.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/hIget2u/tizamefifipirabir.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/3387467043193042.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ifRdtib/56035777895.pdfIn PDF document text
    • http://arboozfilm.com/cute_puppies_and_kittens_photosj4u38.pdfIn PDF document text
    • http://heleogose.online/mafia_city_resource_guidezk3ht.pdfIn PDF document text
    • http://online-bestshop.xyz/sisudagah3syl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_601a2ebb57315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todonoto.epizy.com/background_ppt_menarik_pendidikan.pdfIn PDF document text
    • http://voxosejak.rf.gd/swimming_pools_kendrick_lamar_video.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/28990792296.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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 5608 bytes
SHA-256: 7716986555cfced42efd5572e90b89f62e7feca396b3fba5a48f02be0acdd45b
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 10748 bytes
SHA-256: f004ded6b574aa4898f53d56e23f81e3331561ca5a9e8df071d6a5de80737361

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