Malicious PDF — malware analysis report

Static analysis result for SHA-256 5101ce2829148e90…

MALICIOUS

PDF

74.5 KB Created: 2021-07-13 16:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d9344987931b758c1afb04a2ab74e422 SHA-1: 03971268fc3fac1d6c60084ddfbb2e30dccbcf9e SHA-256: 5101ce2829148e903ea1fb9d2b91afc92862e6f4c0bdace94d84a305757fbb07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. The presence of an external URI pointing to a PDF file, combined with the 'Pdf.Phishing.Trojan' ClamAV detection, suggests a phishing attempt disguised as a textbook. The wkhtmltopdf authoring application and PDF structure indicate it's likely an exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=panorama+french+textbook+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9080a2210ba6bce1135e3/1625884682814/18328988798.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e802cfefb14d112212eebf/1625817807422/sovoxufufimajafuvuzaloga.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec843cdbb514329faf3de7/1626113084513/hollow_points_for_380.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8d4ee0c99b3eb2d343d9/1626115406286/jizusifak.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_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 10916 bytes
SHA-256: d1230eb60b97bf86f8ce762fae25beec7130f91cf20a5e57d7ed071911f08452
font_02_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16008 bytes
SHA-256: 5c1873285994415ad6726877c2a6578158cd43e765c83f435b7007138b991c1b

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