Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8b99e4c6e5e771…

MALICIOUS

PDF

75.5 KB Created: 2021-07-17 17:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 310622442cc6f56ab4aff1159af71adc SHA-1: 2cda8cbf2cd804defcde38bff9f3b0005c37de65 SHA-256: 2f8b99e4c6e5e77117764c30b8a16982fda6c851f97098b0134b44525c539163
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user or download further malicious content. The PDF structure and the 'wkhtmltopdf' authoring application are common in phishing and exploit delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/nCRFBnYrBHY/square?utm_term=blood+relationship+questions+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f10074311eab0d81aa2a8a/1626407028441/karokuke.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7949154eb17b6848f469/1626110281634/mifabimufunupajojemeguwu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca4efe0ada229be5a0bdb/1626121455243/surega.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc5c32e8a4a2aca772c31/1626195395564/using_lavalier_mic_for_podcast.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_off0000c221.bin
f7b3ef3058377a80eb0acdc16d4918ae41ce8ab853969e4145af16614f9c5474		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 17796 bytes
font_01_sfnt_off0000f12b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16792 bytes
font_02_sfnt_off00010942.bin
fe601312310010006dafd5cf853e1356c6ad192878aadcffff03768d29eaf11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 10896 bytes

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