Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8c372b6d354074…

MALICIOUS

PDF

80.2 KB Created: 2021-07-13 16:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a8c6fd6e6b140824f7167b31b94eb39 SHA-1: bac2c1dd889f54f79b2edb0f60d703a4a0359b39 SHA-256: 8a8c372b6d35407473df2623cf47c30ec02aa239a83536183709b3b9498c85bc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identifying it as a phishing trojan. It contains an embedded URI pointing to 'https://pistant.ru/square?utm_term=bear+and+the+dragon+pdf', which is likely a phishing or malicious website. The PDF structure itself is also indicative of malicious intent, with duplicate object bodies and embedded font streams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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://pistant.ru/square?utm_term=bear+and+the+dragon+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e85e1550dfdd18ea50b640/1625841173902/can_a_bad_muffler_cause_rough_idle.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec993f83836e7a7d62bb6b/1626118463941/would_you_just_lay_here_lyrics.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94ca9309bd63f3d875abc/1625902249954/sustainable_opportunities_acquisition_corp_news.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca94f5338e9546e4abcc0/1626122575249/85806217838.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed73836b40a9602c973d67/1626174340010/dav_class_4_english_practice_book_solutions.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_off0000daa1.bin
fc1399774811cbe51f6581b7f946a84a7b936001ee37913e9f23a4b55bae7444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16520 bytes
font_01_sfnt_off000105a7.bin
e9aa0e8ea9791e8fd9752be1392fca3e3377974aef26bf1cb12dfe1538383e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 10524 bytes
font_02_sfnt_off00011d56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes

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