Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6db7f89c00adb7b…

MALICIOUS

PDF

75.6 KB Created: 2021-07-13 19:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a7bffe4bde6e2d4d8d2eadd8096d0b SHA-1: 6004ce227f7b40c0e96d9b7d7a6386f4ee35968a SHA-256: d6db7f89c00adb7bd21bd3c680b6aa8332b7ee1c634d212a1f2969fb5a678cbd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded URLs that point to benign external resources, likely as a decoy. The PDF structure itself is suspicious due to duplicate object bodies, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs. No scripts were extracted, but the presence of embedded URLs and the overall malicious detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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/NsX9ihectO0/square?utm_term=do+i+wash+colors+on+hot+or+cold
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed92ef6be96a4ec40c3da4/1626182383952/50843868064.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e948718915684aa53e6fcc/1625901169736/ruzasapibuxo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec930597282d6f46918ec5/1626116869952/ankle_block_anesthesia.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e95fb237da2614570ff7a2/1625907122206/83524617773.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed2d2f39532c3941be2014/1626156336000/larudojini.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_off0000c591.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 16792 bytes
font_01_sfnt_off0000dda3.bin
7d33e06d68746412434c3c884c6d7f960a777a2700c16b885a583b70cd5ffdfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 16732 bytes
font_02_sfnt_off00010906.bin
36e526a7b5a4b5f9616081f29fa01b1955c0e95daf9c7fc0e7c0e0a7c6432fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10420 bytes

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