Malicious PDF — malware analysis report

Static analysis result for SHA-256 f798d07615f093eb…

MALICIOUS

PDF

101.5 KB Created: 2021-07-15 18:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1da5aac7df1c03d3a7978e4f3e69d4c4 SHA-1: 62057a47815422483feb03b2c148e0ff99776ffd SHA-256: f798d07615f093eb0d46c2ff8ef9e013be1f93f6e2cb5ccc083326af934c4f51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://philabc.ru/square?utm_term=from+death+camp+to+existentialism+pdf', which is likely a phishing lure. The PDF structure and embedded content suggest it's designed to trick users into visiting this external site. No scripts were extracted, but the presence of an external link is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7789

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://philabc.ru/square?utm_term=from+death+camp+to+existentialism+pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e80bba5c1b84600340a010/1625820090806/4.5_linear_approximation_homework_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e961963ba7d954d547ff95/1625907606362/xukosutetexufevid.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8cc9bde79631d340e51c/1626180810058/pros_and_cons_of_autonomous_cars.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f04e7bf8be260d4e460b8b/1626361467097/29069870116.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed20c836a7a57c1cefca2b/1626153160538/genesis_1_26_and_27.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e942a56e267257943be525/1625899685573/chart_for_celsius_to_fahrenheit_conversions.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_off000129d6.bin
386258c318fc2cd24ed2a9d644ef65eff56918d4315819e2b135c7275ba96373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 10964 bytes
font_01_sfnt_off00014313.bin
17a33e211332ca179ead88d530a275fbe21ab81286017f3fda31471a7778b67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 17856 bytes
font_02_sfnt_off0001708c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1708C 16792 bytes

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