Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1387c876b840f4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 23:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c1a52fd45e787d1bc32fbe1a76083b68 SHA-1: af31214004e494e65a3fedb6ddae4f8b336c10e6 SHA-256: 6a1387c876b840f48ebbf905a9009a0f4112ea2d555c1e85dfc1ece4377410a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The presence of numerous external URLs, many pointing to disposable domains, further supports a malicious intent, likely to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://inwebjor.ru/uplcv?utm_term=zack+snyder%27s+justice+league+1080p+torrent PDF link annotation
    • https://manorhair.com/uploads/files/202109071447154686.pdfIn PDF document text
    • http://allycatering.com/userfiles/70234256558.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bb0f262f78401018067fa9e5db43beb2/81564413211.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/ladawuguvitipegakopezonod.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/mamawag.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/29353934698.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/71007130369.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/9829470616.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/ruliruwikepur.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/53252953230.pdfIn PDF document text
    • http://js-space.de/userfiles/file/katosixesenibik.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_off0000ac06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC418 19104 bytes
SHA-256: 53b035ed0dab66ab95e44e09a8e55dbd59db42409d236a7bd7080e2ae1f310d3
font_02_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 11504 bytes
SHA-256: 08a6aa25880f8b030068c7d5c945f77e4ff1ecc419ac9e6b4e3ef76a65a1897e

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