Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5cab0975451d59…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 09:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62bcef7bf22e7ef180c24396426dd5b6 SHA-1: a2131febce639045e07c8f737c1a8535c82c2b96 SHA-256: 4c5cab0975451d59cee1ea77264a033c6450ea2af1013e5bcf88ec491e1db33f
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' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics point towards a phishing attempt designed to trick users into revealing information or initiating fraudulent transactions via phone. The document's structure and embedded links are consistent with a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=android+telefoon+leegmaken PDF link annotation
    • https://alshaabcoop.com/userfiles/file/riwez.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9f473360---nakujulefowidak.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/pazularakajepemir.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/64229240152.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/dudutikebepiwelar.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/selirefo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/uq11cfvbcru7ditq01ts3c187i/velilugiwun.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/silezesefakowaniviwawoj.pdfIn PDF document text
    • http://telecycling.info/files/file/nakolememijaz.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/mavenametazabe.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/76036289942.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d1680d4---73627786395.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/jufit.pdfIn PDF document text
    • http://hainfelderteich.at/pidopomenavejojilufod.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fogodananumozer.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/58327618790.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mumoxowesebufasofola.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/sabez.pdfIn PDF document text
    • https://angem.fr/userfiles/file/55174152410.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/zakalelufa.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/55530607578.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/lupupedawurupafo.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/53721607697.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/70023560010.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/45806058391.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 17784 bytes
SHA-256: 3292f5a69d9ea8033a27a4c74430e3a3a54ff98ecbd77dc28e228b843084a300
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 10604 bytes
SHA-256: 78f57b87dc26e47f901cdab1debc2749785a89eeaa3ae4bb1c54695396d14e3a

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