Malicious PDF — malware analysis report

Static analysis result for SHA-256 e791656663ebe551…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 03:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f278d4fa684eac2439310c6d96fa1ba SHA-1: 5546848ea1ec7987bff1b7b24befedd76acb3e3b SHA-256: e791656663ebe551469538da5f74f42b7c211d1c948e0184502902f955efb125
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on various websites, suggesting a link farm or redirection mechanism. The presence of a 'utm_term' parameter in one of the URLs points towards a lure for downloading a game, likely a social engineering tactic to entice users to click through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://cmuniontravel.com/userfiles/files/zadadexomapip.pdf In PDF document text
    • https://bak.vn/upload/files/siwexibodijuzejibeti.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/koporu.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/kowelofaroxano.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/fovabopi.pdfIn PDF document text
    • https://divinescience.in/userfiles/file/niliwajowaxesafufuxaliwu.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/81579411761564da37b8a3.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ce7e582e---bivuviw.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dufufujibufazavew.pdfIn PDF document text
    • http://www.moyekolodin.com/files/80720093664.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/27304378044.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/35083371748.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/temekakudanajofup.pdfIn PDF document text
    • https://thehouseproduction.net/file/zolofusola.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/38342202363.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/41263738763.pdfIn PDF document text
    • http://otczenacts.com/media/files/32983467193.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/25382593369.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021920157231201.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/62079972332.pdfIn PDF document text
    • http://chapelguild.com/images/usr/resurovebinafevatoxoxob.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/9862790091.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/69216580189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+gta+v+mobile+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 15940 bytes
SHA-256: 731a63a1640b1b5fe223eb61bf44b8af64f1dadf27e7679aed71e7a9c4709d44
font_02_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10660 bytes
SHA-256: e497eb0e43285f7eae63e3df9764459d5684f407e3996082f87570113db85aae

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