Malicious PDF — malware analysis report

Static analysis result for SHA-256 863ffa9fe7082270…

MALICIOUS

PDF

75.7 KB Created: 2021-07-15 11:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fd93317dea63f64515e415658d546d1 SHA-1: 3ddad7649912baed46d1821a59c097e55b768708 SHA-256: 863ffa9fe70822701e0b1c1e9c249d18775146856331dc39f0f69e1658748ace
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are marked as benign, suggests an attempt to lure the user to external resources. The file's structure and heuristic firings point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/eaN1Eb74jJI/square?utm_term=railway+signal+is+which+type+of+lever
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec99094f2b1c51afa5af3e/1626118409688/how_much_does_a_chicken_way.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eddab11c6c1a61d5249d62/1626200753027/irs_instructions_1040_2020.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee90d7c27d1e40a54ece43/1626247383937/xutamowiwejunifexezexu.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_off0000c6fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16792 bytes
font_01_sfnt_off0000df0f.bin
754af6d70f1e36c495ce1052bc3a243eabc1f6ff2ff09f3b9bb2e5098128687a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16308 bytes
font_02_sfnt_off00010927.bin
da10019129220fae70b046d45b96e874d6e808d4478822969a8992121c9abfbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11072 bytes

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