Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f66ec2b94825b26…

MALICIOUS

PDF

73.8 KB Created: 2021-04-28 21:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 70584c386915387f756f2a0cbf0dc7ad SHA-1: 5dd209306958448cdb99c25d05cd05dc7be9dad2 SHA-256: 3f66ec2b94825b26640582e53cc17ef5d0635b2af2ebda3ac4805e77cda24a99
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a domain associated with phishing and link farming, disguised as a movie download link. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external, potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/strik?utm_term=captain+underpants+full+movie+download+in+hindi+filmyzilla PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452376/normal_603e6b9373c45.pdfIn PDF document text
    • http://lisolu.org/aussie_slang_quizp6223.pdfIn PDF document text
    • http://halfraire.xyz/43168710336nnmg7.pdfIn PDF document text
    • http://ampinternational.org/number_worksheet_1-_100rppec.pdfIn PDF document text
    • http://blockingscenery.com/845920915103893r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_602ae8dfd86a9.pdfIn PDF document text
    • http://biomanix.best/the_human_centipede_full_movie_480poxg4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/671d97f1-4948-418c-815f-51514720c94a/how_to_pair_sony_headphones_mdr-xb950bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5633aa6b-1c14-4373-aff8-0f6e90bccebc/what_happens_when_99_year_lease_expires_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9eabfb-81d4-4189-b79f-33b816af6129/6416252603.pdfIn PDF document text
    • http://zexitan.rf.gd/halimbawa_ng_abstrak_sa_akademikong_pagsulat.pdfIn PDF document text
    • http://jaziwosud.rf.gd/estadistica_ciencias_sociales.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_ab58c2a4fc9d44d1804a668f5d6799b2.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_b6d74ddd4c91489db24de2b0df19c967.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_d3fab817d9cb465bb9caf0a4862bc5e8.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_d3bfd5566cf44251b5e85f9927146804.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f9e623-6802-4d0d-98da-99655cb70138/20259379124.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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 5492 bytes
SHA-256: 3518ee7f84a99c2e71e9fca30a1043b194dba3ec9d70b978b763a87fe0c08a57
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10724 bytes
SHA-256: 45120689322216de00694093f8f9698b6de6f1cd7b41d664e31f92829efc5471

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