Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1b8ffbf08af245…

MALICIOUS

PDF

75.4 KB Created: 2021-07-16 03:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f73488f0c74a68e22d3b5747b6e7ef8 SHA-1: da4429001ea5b1e1ea6ee3a35ad7a0a3f0bfb55e SHA-256: 7a1b8ffbf08af245d26e061adf9c9eba92d0936548c8e01b0083d097423bec58
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to lure the user to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7395

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/gOBB6uaVNRA/square?utm_term=pdf+reader+book+style
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f088e3be458d183d461752/1626376419801/55160643176.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e96719309bd63f3d880fb3/1625909017728/36685330068.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0b53b133357608f35d0bf/1626387771461/melonodaka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c747.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 16792 bytes
font_01_sfnt_off0000df5e.bin
a6aa3fafc9fe19d1660c686e2353f894700724d66b6dc493083e61b927ee4d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 10496 bytes
font_02_sfnt_off0000f773.bin
59702a09a96110fd0dbc2921998f69fe784fd69c80be4c9b2eef5f343479c76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 16024 bytes

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