Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc6a406b270d219…

MALICIOUS

PDF

81.9 KB Created: 2021-07-14 00:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 678c92984afc3453cac7e5166f99750c SHA-1: 4f3ae071be136f92e5e18a2043763fa4d944c23e SHA-256: ffc6a406b270d21988606423e353287c81fa316696a1abb2cd51d6c4826e1211
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. The 'Exploitation for Client Execution' technique is likely employed due to the nature of PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/sq/ugae/~3/rCno-htTzZk/square?utm_term=accord+coupe+6+speed+manual
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecab89704a383bbedd82bd/1626123145507/ulysses_the_squirrel.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd3f4b0089c62dc3d1510/1626199028698/my_tooth_nerve_is_exposed.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edd17ec6126f45c3e09c5e/1626198398405/would_you_come_over_and_stay_the_night_lyrics.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_off0000da1a.bin
8483b731a35495dca79df8733591baebe1ef98619bc695c4ed5016cc044bc734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 19072 bytes
font_01_sfnt_off000109e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 16792 bytes
font_02_sfnt_off000121ff.bin
f28685951281011d7fa48cdeea02565df13ec88da4f732b89cfa4dfbbfb8ce89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10736 bytes

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