Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3edd0936ca8a605…

MALICIOUS

PDF

249.7 KB Created: 2021-07-12 21:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f55bb92e17aca8db9b0bcc6988adfb5 SHA-1: d60f1ee525a6ad3a9694f6d95da87c159ce2c164 SHA-256: d3edd0936ca8a605816c62eb87ce8db3acd6cc5e9790fad2e5ed9e528aa3d975
66 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to malicious content or download further stages. The PDF structure itself contains duplicate object bodies, which can sometimes be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3411

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/gOBB6uaVNRA/square?utm_term=doth+in+a+sentence
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7fcb438ed220952aef924/1625816244774/limovaperepok.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e888854a2d4256068c254f/1625852037897/taxamagasumipivaret.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7820ea77fe36cfdb94e7c/1625784846353/evicted_chapter_2_summary.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_off0003843d.bin
85b8ad5075cab53448d4d2cc1360d6b3aee53b32710ca00312683e9f330a9d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3843D 10184 bytes
font_01_sfnt_off00039b07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x39B07 16792 bytes
font_02_sfnt_off0003b319.bin
08774d70825c472df3d64bc079bbe150316ea5817bea163bf47e0ca620cd8d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B319 15608 bytes

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