Malicious PDF — malware analysis report

Static analysis result for SHA-256 504da052d2d3f0ae…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 17:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ff94e01515575c7f46bf78723a13c71 SHA-1: 5bb953d3a26d397fbcb9eaab2b1e5b2d78b4bb1a SHA-256: 504da052d2d3f0aea39ee5cf4a30a74076c9112b1396005e7a20cb561bebd938
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially malicious websites. The 'SE_CALLBACK_LURE' heuristic further indicates a phishing or scam context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=can+you+remotely+wipe+an+android+phone PDF link annotation
    • http://grimastone.ru/files/613715908.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tifegunux.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/64404737412.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/nuvomujaxiw.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/12512988152.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/20540517129.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/14295005206.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/dedebutiwisejuni.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/62935049882.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fatiwifetulunoxurer.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jugusujelezobusurazodi.pdfIn PDF document text
    • http://synhbio.com/upload/files/98627144389.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/19548234250.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55aea8ae2---49189011329.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/96524022445.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/53398600650.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nalovevegasuwevefo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/91718483890.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/veremuzebonibuxemitu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qggivvimgi1qsogda7k62u8r74/50081959979.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/vizizudoxelolemojuri.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/bafisa.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/luzuwo.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://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_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 10820 bytes
SHA-256: df9992ae64f96e9ed754b35e5235b4547c05a757faf80363d1bc4d42259692bf
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 17832 bytes
SHA-256: 994188474f403d2b0c71af43bda996f84b9a785d4a189a5a18333416248b54d4
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1