Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f32007058d4aac2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 19:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5d93d68bf75410c72309ff8336fc8a78 SHA-1: 6b093c3fc6a2a069f49896382f5348c7a8ef4313 SHA-256: 9f32007058d4aac2a14d4cb78e1ec58361c84a4c6cf495f54c0054b1b6c36e74
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a callback phishing lure. Although no executable scripts were extracted, the document's structure and embedded URLs suggest it is designed to trick users into initiating contact, likely for a scam. The presence of numerous external links, many pointing to potentially disposable domains, further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/poxukemedu.pdf In PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f46b5d9d137eac29aa4bfef7becd2666/41278538928.pdfIn PDF document text
    • http://bienbao.net/uploads/files/45843536767.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fijuxasisanunajubawel.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/beduluwojukes.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/14886763105.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/bizaxilevumasezebopad.pdfIn PDF document text
    • http://cartopack.be/Images/file/71554085715.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/fopike.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/remuxexiludegafiku.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/renono.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/1584009919.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/49355418714.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/87224306351.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rj80efv4epfifvrvgk2l6fp4oh/luxijimoluvaxotufol.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/naxanuwuxa.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/vunoz.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/98354496142.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/tenuluxoputesebe.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/lifagirun.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/vokusewekafuwupejipop.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/jarekizukis.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/54213455771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+export+contacts+to+new+phonePDF 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_off0000b77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16016 bytes
SHA-256: 93ec5729776b85616e9d34a80e59daa0ef590500a97bdc21e50b83b676ff787c
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 10512 bytes
SHA-256: 72b00936871a67747eeab0b1e6f46df6f539dc6cd302beb4a8a8698cf90d7b0e