Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa4ad57de7f7330…

MALICIOUS

PDF

87.8 KB Created: 2021-07-13 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7453c708be44b7588008a2e8fc4282ad SHA-1: 8755adcc95ce8ea978757582b5d57bef0068fc1a SHA-256: daa4ad57de7f7330201d6ee120d9a4aa2cbc74ea975435f84c2bdf68c7b714c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'https://krisoc.ru/square?utm_term=diploma+after+10th', which is likely the malicious landing page. The document body is heavily obfuscated, but the presence of the malicious URL and the detection signatures strongly suggest a phishing attempt disguised as an educational document.

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://krisoc.ru/square?utm_term=diploma+after+10th
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed6dc7f95b5524f9533da0/1626172871774/stomach_pain_and_reflux.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8d4cf83a7f26ecd1463a/1626115404779/gumakurojag.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8a8cfe047727940c62b6/1626114700334/how_to_change_app_install_location_on_windows_10.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e85a1e8f65f47218918de7/1625840158617/the_worlds_largest_diamond_producing_country_is.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_off0000f8e3.bin
24e00edbdeaf061be5a2ff65bb122a2d1972a589927cc256a08ad8f59eb98a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10528 bytes
font_01_sfnt_off000110d3.bin
f0359bbb09806cab59967850b1abad8af2529f2c9490056aac56af9ee91e2009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 16640 bytes
font_02_sfnt_off00013bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.