Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfb9e5fd00c901f…

MALICIOUS

PDF

73.1 KB Created: 2021-07-15 10:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aadb910be32f96af04eb7676ec9f123c SHA-1: f23aae884f76c6d9643f2178e64b1aeda70df8c7 SHA-256: acfb9e5fd00c901fd29f9552f2b62de1e97825af9fd3ff9ae0429afddc4cab4e
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs, though many are marked as benign, suggests a potential vector for further compromise. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1797

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/AG-UZpNbJGc/square?utm_term=describe+the+different
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec831a82b4c978cf41a22f/1626112795001/the_lateral_dimensions_of_class_d_airspace_are_based_on.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed27d2c927da2a63f7bd64/1626154962389/pozebedobifuvavez.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_off0000bf60.bin
a642ad2f349a6135074429ae6be278cfb865722ebc5e030e2cc5886117f85fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 16304 bytes
font_01_sfnt_off0000e9b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16792 bytes
font_02_sfnt_off000101c9.bin
f32e1fccb23bb4834e4efb6d1fa63510d33b764f5bfdd4c395fd363764e91803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10388 bytes

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