Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f63166c091e577…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 13:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2853372449bbbeae65ecf1f1426230a SHA-1: cb3c1e13a6f5ebb36723497c1c74f1a88888a282 SHA-256: a1f63166c091e577461457830c8b4c436c1761c60d92b31e8308f4758047bae2
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 high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential delivery mechanism for further malicious content. The PDF structure and the wkhtmltopdf authoring application are consistent with exploit delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/gPkW7oTCsL0/square?utm_term=how+to+change+notification+sound+for+messenger+on+android
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ef9a2c5c2f6215c6e488/1625878426733/numufimiki.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9457e0914637f38c48f1/1626117207835/not_answering_phone_quotes.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e84666ad723f3b6758fb35/1625835110547/pafopedilo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e87253c0564a3341a621f3/1625846355814/lean_in_imposter_syndrome.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed22442ae47d2ac91f5e56/1626153540580/18_sgd_to_php.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed1d0950bb312daecaa423/1626152202001/91985099311.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed1a318c96c6301f90bc56/1626151473814/wuzuwolexodawokadokek.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_off0000ca0b.bin
adea968428fcc529b58aba2de57b00635cb76e12f4f50dcaee842dab267b22f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 11052 bytes
font_01_sfnt_off0000e36e.bin
a40937c92d585e23272f3b77d3c4b86c35cc071d55d85d4028f67d96a330ebdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 16528 bytes
font_02_sfnt_off00010e72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes

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