Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d32564af07c023a…

MALICIOUS

PDF

67.6 KB Created: 2021-09-17 20:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 063e2506efdcbbb46a61b82d60b7202b SHA-1: b9c5d1a2ee5a4ff53345a4f4ffc38943e665c8c7 SHA-256: 6d32564af07c023ad9569cc721f9794a811ac273e5aaec31100b0c482a36eecd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a network of disposable domains hosting other PDFs. While no scripts were extracted, the numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://podarox.ru/public/files/lelawusafujudazane.pdf In PDF document text
    • http://lapawan15.com/shop/fck_file/file/91410715109.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fizabemenedezuputamas.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/kefupinukonolupes.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/59630543527.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/nasukivokugi.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/85696450695.pdfIn PDF document text
    • http://pbpharm.com/upload/files/jabolowisowu.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/mopavef.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/3849802577.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wisigarojesiwamasipevi.pdfIn PDF document text
    • https://rubfila.in/files/file/54948143065.pdfIn PDF document text
    • http://fitviewer.info/files/file/1467821887.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/visemasexu.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/ladirigadafozejovowuguw.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161426e8f4f809---50158648786.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xadopeloxizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=redmi+9+secret+featuresPDF 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_off0000aafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFB 10680 bytes
SHA-256: 2562e70d992a2628dbda1dfc443cdcf2b1ab734b954fe1a15342f9f012615045
font_01_sfnt_off0000c388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 15032 bytes
SHA-256: 0cdcff4f952fc37480e7e37b05ff014caad2d2c830ac68ac706ead2f80fb10b5

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