Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75e49ecbf02edaf…

MALICIOUS

PDF

66.5 KB Created: 2021-09-27 03:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99255a5a01b30e7e22f5f18155aa45aa SHA-1: 6eb697e696ca1aaf041fc7f5c374ad597e264ed7 SHA-256: b75e49ecbf02edaf48036c3550729a6dcf153c53c275d6cdb4ebb69267ba5859
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a phone number for various service-related issues. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to deceive users into engaging with a malicious entity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://szyoujin.com/UploadFile/file/20210922194326351.pdf In PDF document text
    • https://immo-macedo.lu/userfiles/files/wesudobonegolapofagoki.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/87008252488.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/kutekivilijulefodedimu.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/pagozitu.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/bedemodafaxed.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lalorila.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/17260061864.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2858a212---359004087.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/tavufejetujobu.pdfIn PDF document text
    • https://sim2007.com/files/46528598987.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7cb4a899---vubaginotiw.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/fobomiwobez.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tatitimipoluwijepita.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/96613233262.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wirotovetapololuxenebibud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=%C3%B1+words+that+start+withPDF 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_off0000a633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 15364 bytes
SHA-256: 0d047828c6296232b38bf4f28972c25a2ad96689cefca5c9f33a7db3cef943f2
font_02_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 10236 bytes
SHA-256: 8830dc4af91de0431dddb62ce8549e4a348b354954d15fe3ee9b09143cd5946f

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