Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f818308b3b8894…

MALICIOUS

PDF

76.3 KB Created: 2021-07-14 00:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9699fbdbfff084b2c272a2181ad7d6dc SHA-1: 1dfabbfef11fca763496b9ec60794b5cd995c442 SHA-256: c5f818308b3b889479cb0598c845cb65efb48ee7a29cc907e7ee901f29e3868c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier also indicated maliciousness. An external URI was found embedded within the document, pointing to 'https://irlanc.ru/square?utm_term=pern+books+reading+order'. While no scripts were explicitly extracted, the PDF structure and the presence of an external URL suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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://irlanc.ru/square?utm_term=pern+books+reading+order
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee06b98e89d93564d931fd/1626212026058/76953242212.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7cb916e46386ca3bfd51e/1625803665802/to_actively_participate.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee028880caa629c1e0190a/1626210952687/luzemesixakolunolufo.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_off0000cb14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 16792 bytes
font_01_sfnt_off0000e326.bin
6ae85d9f86974d3f27d9cb0ddd5d6cc92afd3ad3dd8121518cf699d29e42f983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 16524 bytes
font_02_sfnt_off00010e06.bin
7fe5b1a0de0ac766e6f4a9fff184b951e7fcc7148203b49c127e364c22e3a71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10512 bytes

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