Malicious PDF — malware analysis report

Static analysis result for SHA-256 a831d0557344bba1…

MALICIOUS

PDF

75.6 KB Created: 2021-07-13 09:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c80add33ec525229aaef566e3af74cc1 SHA-1: a571509ac58860d702b6fe83733907761f39fd26 SHA-256: a831d0557344bba199313538f18e70c550210f6b1b7a09e5af058dc72c399a28
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of embedded URLs and the PDF structure suggest it's designed to lure users into clicking malicious links or exploiting vulnerabilities. No scripts were extracted, limiting the ability to determine the exact payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=how+to+connect+windows+to+chromecast
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7999486d8930991a29474/1625790868679/zuduboxonuwej.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e872712f604d1a8d8d1662/1625846385213/wings_of_fire_kindle_free_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eced5dff6d86145b99c1e9/1626139997374/robert_frost_poems_with_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7cf897d3b385c94b51a11/1625804681361/population_explosion_causes_and_consequences.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_off0000cab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 16792 bytes
font_01_sfnt_off0000e2c8.bin
5e18f222a077fded7636d1dc44adf9cbec82cb62f319e1d0b8a7e33bee61b754		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10668 bytes
font_02_sfnt_off0000fb0a.bin
659cf8a44a000341eff74b83cb63172424d5d032829e5339a53bba1d8c67b2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 15488 bytes

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