Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d9b43f067750cd…

MALICIOUS

PDF

74.1 KB Created: 2021-07-15 17:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4846a653ccdaa670183b16d4921ad7db SHA-1: 8ee6c78b39e236e4bcdcaf0e7646f5d1b0234c30 SHA-256: 71d9b43f067750cdc62c15f3f0571b9293ffabc62f0e28ba3b85661fb52dd18a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing and trojan detection. It contains an embedded URL that, while currently flagged as benign, is presented in a context that suggests a lure for downloading content. The PDF structure itself is malformed, with duplicate object bodies, indicating potential obfuscation or an unusual generation process.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2592

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=kgf+chapter+2+full+movie+in+tamil+download+in+isaimini
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9d425860d606f4826eae/1626185027223/to_wither_away.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edfd657ce58f02ed9703cf/1626209637984/79459936164.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_off0000c0b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 16792 bytes
font_01_sfnt_off0000d8ca.bin
2dbe0f60dc31670538e486efa2ba3eb5e1a4509e9629f92405a10ebd16e7677a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 15860 bytes
font_02_sfnt_off0001017d.bin
bcaf261496b3d501b12143165af8663c44bf343f0fbbbd0073189e2753d0cce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11428 bytes

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