Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1b344cfb3e093f…

MALICIOUS

PDF

170.1 KB Created: 2021-07-18 16:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd1c1d43616cb4fb866a0e1670eace49 SHA-1: 49cd566fe9623402bfeb89f16c6e26e84aa1e22b SHA-256: fa1b344cfb3e093f0eab057da78da50c617f18d19d46856eade8c96caf488d60
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as 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 unusual elements and duplicate objects, indicating potential obfuscation or exploit attempts.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3506

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/razvivatel/yapz/~3/UZrB20b2Dcg/square?utm_term=chopin+famous+piano+pieces
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee8a168e3fff2bd3c473a3/1626245655051/nuggets_air_fryer_time.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e788c5adf2c26882fb690e/1625786565560/lewis_dot_structure_maker.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8f84b2c5c2f6215c75023/1625880651962/quick_easy_weekday_meals.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_off00023355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23355 16792 bytes
font_01_sfnt_off00024b67.bin
5d14b7f124a8e2feb6337b2ba3136886ca1a9f8f97857a5c0fa5ef8bc46d0e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24B67 23508 bytes
font_02_sfnt_off000284fa.bin
f2e2e332a52ab383abd1aa93c6532705584d69cd706ff00e16cd75ec492d9e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x284FA 10632 bytes

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