Malicious PDF — malware analysis report

Static analysis result for SHA-256 7deb8fe528aba540…

MALICIOUS

PDF

74.5 KB Created: 2021-03-03 13:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b049475e33bd44bc29aef7cd5e4b26 SHA-1: da57e8f7668a70c679ed491d6b1f9c62c9e63300 SHA-256: 7deb8fe528aba5408045efe835f598c6ca1e1d8566e732e11f114b5e57c0c844
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content, likely as a phishing lure or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=how+to+use+nulaxy+bluetooth
    • https://static.s123-cdn-static.com/uploads/4406455/normal_60069f95311a2.pdf
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd090d59006c.pdf
    • http://ig-soft-team.com/halloween_printable_worksheets_for_kindergarteno873m.pdf
    • http://proflist-briansk.ru/319199418883hkku.pdf
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/rimibise_zedizibenomake.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_6033df4ec308c.pdf
    • https://static.s123-cdn-static.com/uploads/4501214/normal_600037c281899.pdf
    • http://mini-cam1.club/6856496393315zz0.pdf
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/9b2274.pdf
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fd190cea28f5.pdf
    • https://static.s123-cdn-static.com/uploads/4477367/normal_5fcc2f13a75a4.pdf
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5fe7dda2aac9d.pdf
    • http://help-lnstagram-verifycopyrgiht.com/british_council_library_membership_application_formgwphy.pdf
    • http://alfa-quest.ru/chief_boatswains_mate_rankb2ts2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jarawaxanivu/vmware_vcenter_converter_standalone_5.pdf
    • https://s3.amazonaws.com/tokit/9855990603.pdf
    • https://s3.amazonaws.com/lezerawe/4505094884.pdf
    • https://s3.amazonaws.com/zalomi/52693395361.pdf
    • https://s3.amazonaws.com/gixawetopoli/2367864446.pdf
    • https://s3.amazonaws.com/jeromopelurab/vampires_werewolves_and_zombies.pdf
    • https://s3.amazonaws.com/mubemutolewe/ejemplos_de_cualidades_personales_negativas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58f.bin
9f3d470f296b9bf13f77740bd10c6f8f9378f56d5dd2d161186641e5b1e2d8ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 5040 bytes
font_01_sfnt_off0000f6cb.bin
48511af1f944c53bbfba2ca4529f24ce3f91ea1f80d00063452a8ab887dc2db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 11332 bytes

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