Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1af08afe4693b59…

MALICIOUS

PDF

73.8 KB Created: 2021-07-20 12:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 905a559d572287ff26f29cc5341bb99b SHA-1: 5ac22b6ad0415791449063977d4d78dc7b2c1991 SHA-256: d1af08afe4693b59d4da2e554098659db1fe1af9eb712bef15e4a3e13512f6a3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. It contains an embedded URL pointing to 'archism.ru', which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and embedded URI suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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://archism.ru/square?utm_term=song+of+citation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec93f077250868136e282a/1626117104216/saved_by_the_bell_the_new_cast.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1f411c7f9ba204f8297a2/1626469393815/cbt_for_intrusive_thoughts.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f450ad1434f635472dea4e/1626624173860/the_road_to_world_war_1_worksheet_answers.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_off0000c382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 16792 bytes
font_01_sfnt_off0000db99.bin
573817f262e25166f6c8b50a00905fb48df8b9f10ebad9265e9d13ec55fd249b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 10140 bytes
font_02_sfnt_off0000f26c.bin
a0b1314bc805c28a742cc6badd23071614a63dfe8418804540a5aaae9e9f99a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 15980 bytes

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