Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a4e22df6bedfcb…

MALICIOUS

PDF

73.8 KB Created: 2021-07-13 20:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e134acc4b7dd6d6d9b579377a4b0b5e SHA-1: 24bc5c7b791139a6e6fff219b53d7e9c66f43d6f SHA-256: c0a4e22df6bedfcbdb2f21cd4dd18d1bfbf5c52f74aaca73505a7695675993f2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded URLs, some of which are flagged as confirmed benign, but the overall structure and detection suggest it's designed to deceive users. No scripts were extracted, but the PDF's nature and embedded URIs point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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/UkUWPC8UKDU/square?utm_term=event+management+research+paper+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed267c8c96c6301f9163f3/1626154620976/93792624901.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91c2b83ae0c490238e084/1625889835654/transport_in_cells_pogil_answers.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e82ac1f4d7c53d8b166ca8/1625828034168/heat_capacity_at_constant_pressure_equation.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e834424aaab0286a8e5bc3/1625830466247/lidobezamozukumolanit.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7ad254a52c186ce4090e/1626110674390/definition_of_preposition_conjunction_interjection.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_off0000c35c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 16792 bytes
font_01_sfnt_off0000db73.bin
a84ba87923022f459d9220d22365dd205793f97ecb799b4d904cc459232b163f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 10856 bytes
font_02_sfnt_off0000f41d.bin
7cc8faeb9752d3f7fdc21206fa3bc593754448814c3ca6311355046bbba8bb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 15360 bytes

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