Malicious PDF — malware analysis report

Static analysis result for SHA-256 b286c42731b50af0…

MALICIOUS

PDF

74.0 KB Created: 2021-07-13 00:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33e5033f85fb880f11ffa8bf0483b738 SHA-1: d1ea03c94a11a9cb91ad761a564dea2817eeef7f SHA-256: b286c42731b50af0a1f98a61375c968c3f71243f109da388f8897ca2bb94ddc0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'https://krisoc.ru/square?utm_term=self+evaluation+communication+skills+examples', which is a strong indicator of a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of PDF malware often involves exploiting vulnerabilities or embedding malicious JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7629

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/square?utm_term=self+evaluation+communication+skills+examples
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecafdc5f54a92f3bf7db9b/1626124252826/what_is_it_called_when_a_gas_changes_to_a_liquid.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec79b2fa40056e74d13cf1/1626110386235/68399384312.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d4f1e2705b436309978e/1625871601675/just_chit_chat.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec789be64ce5371633ac49/1626110108126/nojatesetadera.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_off0000c4f5.bin
5cf5a58a184afca77fee39fdf9b407ee2bec7941419227095e82611cea7a86a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 10976 bytes
font_01_sfnt_off0000de76.bin
c8756c5932657650530f071db9cae15d67d8db8582d8711a5f9d075d45c67ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 14824 bytes
font_02_sfnt_off000103bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 16792 bytes

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