Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8a130a7a1ad6c0…

MALICIOUS

PDF

73.8 KB Created: 2021-07-12 21:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43c38502aea6c5d2cc27ecc9ef712ff9 SHA-1: 313e781b16e3f17754d7e4ab6c838d2cc7bfe0c9 SHA-256: 5a8a130a7a1ad6c0b3d147660d23214f72aedf7067ef489c9104fd30a3635e3c
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as a phishing trojan. While the embedded URLs themselves are confirmed benign, the presence of an external URI and the overall detection strongly suggest a malicious intent, likely involving social engineering to trick the user into visiting a malicious site or downloading further payloads. The PDF structure also shows signs of manipulation with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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/UZrB20b2Dcg/square?utm_term=red+cross+lifeguard+certification+test+answers
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7c34adbc52028c83e503e/1625801546320/irs_taxpayer_assistance_center_near_me.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_off0000bc96.bin
2355f2ecb8e36049abfb0f34ea7af179c45fd93cf13d327b71934d82ee17029f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC96 17392 bytes
font_01_sfnt_off0000ea27.bin
0e719d325abca4fc295b7d1750c944aa3fb39a4fe9f1d4117bdce2487399604e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 10884 bytes
font_02_sfnt_off00010349.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 16792 bytes

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