Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f755b9ac7abd69…

MALICIOUS

PDF

79.9 KB Created: 2021-07-13 17:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 985a160f6ebd393c12396ffe7306ac03 SHA-1: 4d15feed0597261add5f190ce7bde3089170ba4c SHA-256: f8f755b9ac7abd6936534e7ab1b2d996ee40bc11f111f867618e1a5669755ffe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, suggesting a phishing attempt disguised as a stock purchase agreement. While no scripts were directly extracted, the nature of the detection and the embedded URL strongly indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8049

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://infrive.ru/square?utm_term=pro+buyer+stock+purchase+agreement
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec932a7dc7460dd09c1875/1626116906948/latin_words_with_z.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c3283e172817b39c3e0b/1625867048171/class_3_english_solution.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9446b2210ba6bce133c96/1625900139446/using_filezilla_for_ftp.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e791327d3b385c94b18774/1625788722579/fitev.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95110b10b9b33fa992a71/1625903376521/8763652869.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_off0000d253.bin
5ab3f63d8248656e4b12113d69381004ca0353054d802596d3598c73788025ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 11128 bytes
font_01_sfnt_off0000ec0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
font_02_sfnt_off0001041c.bin
c28b0ee1b5d2531d32ce774fba7c8af90119a923b59dc8aa5cfa55c17a311f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 17620 bytes

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