Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c161d110921aa81…

MALICIOUS

PDF

75.9 KB Created: 2021-07-18 09:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47e65f76a89d0c04d3fe7c760cfabc7c SHA-1: 23d782ee12db522acabd78328179b53f10f2aa62 SHA-256: 6c161d110921aa81c5924241022a0427bbc5e0f3a6bed8eb9d29e082e88c38fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and the PDF structure suggest it is likely used for phishing or to deliver a secondary payload. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/X6hrLWyzjlw/square?utm_term=gnocchi+and+ground+beef
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eca32c651b7076defdad72/1626121004403/how_to_know_who_have_visited_my_instagram_profile.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8faa319a9f87deb713d2b/1625881251521/xitaduwisutorome.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f36d115f13a15bd8201b92/1626565905627/double_tracking_bass.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f19583937add1fa80facc4/1626445187837/bufapowi.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_off0000c6de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 16792 bytes
font_01_sfnt_off0000def5.bin
3590447811e6bf9f0de8fb95138793074e8f382cbc4fa63a28742c44c9cf4930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10724 bytes
font_02_sfnt_off0000f744.bin
9150483a0d15eba35d0b24b97b490b0c48a1ae53e15e1e3a21d172a0878e319f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 17092 bytes

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