Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1acca5774d275aa…

MALICIOUS

PDF

74.3 KB Created: 2021-07-13 19:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7840169ccba300681506fa6747652324 SHA-1: dc4d53485a0ff640775e6e74497d8ec7f3c28518 SHA-256: a1acca5774d275aa09af146d0b082a302da1510458db8cc560f5756642824592
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to 'krisoc.ru', which is likely intended to lead the user to a phishing or malware distribution site. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2592

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://krisoc.ru/square?utm_term=funny+text+messages+to+send
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94ca9309bd63f3d875abc/1625902249954/sustainable_opportunities_acquisition_corp_news.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9d6c0999c4520372305e/1626185069042/atomic_packing_factor_and_density.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_off0000c1f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F4 16792 bytes
font_01_sfnt_off0000da0b.bin
785c2ed09360e84e7984233f880dd92a05030501a2f71b7a2122bda23053c094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 10644 bytes
font_02_sfnt_off0000f249.bin
97273becd9c711117f17d077efbee8a95370dfd1d1d436e1ada922eaa691e770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16964 bytes

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