Malicious PDF — malware analysis report

Static analysis result for SHA-256 171782795b7a92ae…

MALICIOUS

PDF

112.2 KB Created: 2021-07-18 17:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e60dafbe858131e6afa116ae6ff3277 SHA-1: 6b841a77fd19298720aa27430d384dd646163f34 SHA-256: 171782795b7a92ae859759f2b202f64bd0e53bafe4eda452771766f6121eb88f
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 it is likely a phishing or malware delivery attempt. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content or download further payloads. The PDF structure itself contains suspicious elements, contributing to the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6270

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://feedproxy.google.com/~r/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=go+transcript+test+answers+march+2021
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee4b797426fb5109f5a5ad/1626229625825/evaluating_a_good_dance.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f08197a45c1f1e8e18a07b/1626374551906/animal_cell_culture_question_paper.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f193f0b1fd262d2da778fb/1626444784292/the_center_for_endocrinology_at_mercy.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_off000155ce.bin
24aa792446680b8d6c8a2b853e73c74db42b108a270e24d7654786cd457e74db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155CE 16896 bytes
font_01_sfnt_off000181c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181C7 16792 bytes
font_02_sfnt_off000199de.bin
97d254d882ba3bb2fbeae01b2c0877ab0bc704d62f7a2d1882a262cd61d99352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199DE 11012 bytes

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