Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3a0b50606f4303…

MALICIOUS

PDF

76.5 KB Created: 2021-07-12 21:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 466afd10991c77d49fbd1a2eead6a5ec SHA-1: 7bf9e4b130638b26a96f9ccfcd9288ee30a9fa5f SHA-256: 9f3a0b50606f43031a4b6b13dbfe2e5342f14210a7b80198de437ae8a08b6ca6
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 redirect the user to a phishing site. No scripts were extracted, but the PDF structure and heuristics indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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://wastran.ru/square?utm_term=x+ray+crystallography+nobel+prize
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e82230fdc75e32ab0a5ef0/1625825840995/combustion_of_methane_chemical_equation.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8b3ea82ba4103f29554cf/1625863146743/sudha_murthy_the_daughter_from_a_wishing_tree.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7dd14c0b954f9ea3a353/1626111441169/download_gta_3_in_pc.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9414012fb7d0b279470a4/1625899328424/call_of_duty_beta_apk_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8faec309bd63f3d847532/1625881324376/meter_map_scale.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8b9c8300fd66e197278c/1626114972546/very_well_liked.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8ccbf4b4775d049fd737/1626115275353/57548847397.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_off0000c76b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 16792 bytes
font_01_sfnt_off0000df7d.bin
05dbb1e133f52278dcfa5ebc49e7f469c0eb6a14a7763606d747ebfe9463067e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 17236 bytes
font_02_sfnt_off00010cd9.bin
feef38bd48ecf23fb59341fa13d8f9f42ff7ca674535159618735a1eaccc852e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 10972 bytes

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