Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f513a7313c3379b…

MALICIOUS

PDF

82.7 KB Created: 2021-07-12 22:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8546e13278aa5fe6025231447bbf6859 SHA-1: c4f5056994ac4a24dfde94994baa1679988bbcc0 SHA-256: 9f513a7313c3379b55eef59706b163e1ab9e0c80d9166e47fa8c75d9dd652fd3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains embedded URLs that point to external resources, suggesting it is used to redirect users to potentially harmful websites. The presence of embedded URLs and the overall detection as a phishing trojan indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8847

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://feedproxy.google.com/~r/razvivatel/yapz/~3/7R6buoffwiA/square?utm_term=diaphyseal+femur+fracture+icd+10
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93407e51f1f218d6aa342/1625895943586/group_2_old_question_papers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8bd03a853d606aed5c33/1626115024227/91466853006.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec88ff4c0b954f9ea4bb76/1626114303897/chemical_engineering_fluid_mechanics_notes.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8768cc9bfd671df370d25/1625847437285/electrical_resistivity_si_unit.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec89a7760c9e2bcf43989e/1626114471408/expensive_house_in_the_world.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7f3659713006cbe0edfb/1626111798450/5742475214.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7f4ae45e16b3be7eaddd4/1625814190430/wotalorasogusiwudexojis.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_off0000e06f.bin
7ec2c3fca221dc45c197e62b529e3b8f2ea1f0603becec50ebd7301093e39bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16960 bytes
font_01_sfnt_off00010cbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 16792 bytes
font_02_sfnt_off000124d5.bin
ad64353444ec5d16c9f0fe8302904a259617fba83037449270c0a1495875804e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 11052 bytes

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