Malicious PDF — malware analysis report

Static analysis result for SHA-256 facfa355f018cd3d…

MALICIOUS

PDF

78.0 KB Created: 2021-07-13 18:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f57e56f526ff5d502b2737d314dcf04a SHA-1: 7f22bbf82b8126af8cc130f4836dbb77f9120a25 SHA-256: facfa355f018cd3d9f58f8dbc04c6c6f40774fef469e55c3ada2510cd1c093a0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to direct users to external resources. The document's structure and heuristics point towards a phishing or malicious content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/sq/ugae/~3/nCRFBnYrBHY/square?utm_term=transformers+prime+the+last+knight
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed8b36f8b4e244e4fff7a0/1626180406945/persona_4_game_dungeon.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec916fbc6eee4b058f5a48/1626116463849/textinput_value_in_react_native.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec832b0cf33f708d7a69f9/1626112811432/spouse_the_truth_about_marriage.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ef563f195e1e4033ff58/1625878358536/artery_in_your_thigh.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d76897884458c9a19ca6/1625806696522/74737538641.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_off0000cbfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 16792 bytes
font_01_sfnt_off0000e413.bin
adcb4f255cb7f8332f2136a0e64a3326b6582c3232558ea988bd2d0299829834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 10860 bytes
font_02_sfnt_off0000fcf7.bin
c26731fa3aa2672148e192002e47ef6230e7b5eb99561829306cc5dc937ef0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 18364 bytes

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