Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efeba1c6e33e642…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 07:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b6ec55b29c066bffc7f8697d9a76b87 SHA-1: b8eabdd1250910e70e297acfc73aa2484ed8fa7e SHA-256: 7efeba1c6e33e642ef004879f5f4da57c7856c9e853762c221e04e5cbaf64588
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. An embedded URI points to a suspicious domain, likely a phishing lure. No scripts were extracted, but the PDF structure and embedded URI suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5959

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://inwebjor.ru/square?utm_term=christopher+doyle+chungking+express
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec931d1d0b3933755247d6/1626116893209/sixogaginojupurabumew.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9d699a9df7051d3f43b9/1626185065923/biggest_swamp_in_the_world.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e829a581ab8d1aa9e20b90/1625827749398/39356131088.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8bccf1b56fd057579dc95/1625865423644/the_principle_of_utility_can_be_summarized_as.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_off0000f299.bin
e2c43ae300375250b704ab8976f40ac8462990c1a3b2d3a20dd15345fba72cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 17444 bytes
font_01_sfnt_off00012037.bin
55fa20b6b2a59d36a07b0c14f82510040662fa0fb1394ae4af5202cc94066ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 11072 bytes
font_02_sfnt_off000139d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D3 16792 bytes

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