Malicious PDF — malware analysis report

Static analysis result for SHA-256 936f46b4cd1f55e1…

MALICIOUS

PDF

100.9 KB Created: 2021-07-13 20:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 310a34e76533a1b9daa677458f9fd694 SHA-1: de20230665999560ba51c40323cf0f079a47775b SHA-256: 936f46b4cd1f55e10981d9b3b792040bd1bc47bcd0efcef97e31f1b41e58c907
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the presence of embedded URLs and the detection signatures point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7925

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/XMoLd4EPXkg/square?utm_term=integumentary+system+diseases+list
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e831f0f4d7c53d8b16bac0/1625829872265/portrait_of_a_lady_on_fire_criterion_collection.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94a08b10b9b33fa98fd8a/1625901577104/how_to_cast_my_android_phone_to_my_smart_tv.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed0fe73b21860fe66d00e1/1626148839159/dapifajigurivoruxojat.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7c1d997884458c9a0817f/1625801178078/auc_value_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e813fd7e45264421faef19/1625822205352/novoxiwavise.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_off000129b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 16792 bytes
font_01_sfnt_off000141ca.bin
c24eb67cd22b3dcd94c803b5dcf2067a7574b091ebbf196359aa522a73f690c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141CA 17508 bytes
font_02_sfnt_off00016fa5.bin
8a73bc50c9362f80a21e3cb6b1a3c4d6364218a8d1fd96ef3c529c1568f213ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA5 10636 bytes

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