Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be6c0f928a1fc6e…

MALICIOUS

PDF

76.5 KB Created: 2021-07-19 07:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00d8eef73960c9a5fc126f7be6a58fb5 SHA-1: 43b27f146d6d01a312e1744b6fb208d513116afd SHA-256: 5be6c0f928a1fc6e4a6c7b24e9862209797fc9974b381ca3e4a1d76685c57c08
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content or download a secondary payload. The 'wkhtmltopdf' authoring application and the nature of the heuristics point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/sq/ugae/~3/u8n3KCQdUYc/square?utm_term=which+pokemon+can+evolve+with+unova+stone
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8c9d7b14134336dd51e8/1626115229414/mezcal_is_made_from.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3d8b66d5e991e36e57c44/1626593462993/nimateson.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f243cabb7e64222ded561f/1626489802907/how_many_languages_are_spoken_in_singapore.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f078e2eae63a0625b45cbe/1626372322866/how_long_do_cockroaches_live_without_food.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee466a3753dc428c88eca3/1626228330671/vatajomu.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_off0000cbb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 16792 bytes
font_01_sfnt_off0000e3c7.bin
b0118b65b5ed1921b6bd918e01112258d99abf0f46143cd8abcfe77403fca4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 16064 bytes
font_02_sfnt_off00010ce1.bin
de793818acb1f642dbb69fe2a8221d3ba7761d18f82ad5723663316dda45f759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 10876 bytes

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