Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f4b99fbae5f729…

MALICIOUS

PDF

74.3 KB Created: 2021-07-20 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2162950be92731772049a420ba66d481 SHA-1: d5ed593846309b638904bcc2fe4d6a3b1fca0257 SHA-256: b8f4b99fbae5f729e6c233bc5f076915b6dc7645c361b5b2438f743d86b73386
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to lure the user into a phishing or malware download site. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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://nomylo.ru/square?utm_term=thanksgiving+shepherd%27s+pie+with+stuffing
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecc3970f4a722977fbe23a/1626129303631/firac_format_example.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee7910462f394a1e45a907/1626241296552/4_pics_1_word_16_answer.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edf33f82b49873592c322a/1626207040073/current_sealed_indictments.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91b0db67368755967999d/1625889549887/kaxosikotavarisevanipurel.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_off0000c0cc.bin
f32f1280aa5637955dd4996778e6b34983300b5ad4e35ccab4a5ab9a1695fb5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CC 16732 bytes
font_01_sfnt_off0000ec3c.bin
658c68a2ab16bbe3f99bdeb45e51eaaf71e6d9ff8b983654a6cf9d078f2989e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 10952 bytes
font_02_sfnt_off00010578.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 16792 bytes

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