Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a443d6d943d8a…

MALICIOUS

PDF

78.8 KB Created: 2021-07-12 21:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33b2bf81fdd9752c9256c8f6c813aa6e SHA-1: 236836c39875171f4f6d506ae7864cba3259c9d8 SHA-256: 172a443d6d943d8a23ac506d357d1923ff2441d4d695151ceac11594ae314ae0
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 URIs, specifically one pointing to a 'macro calculator for weight loss' within a feedproxy URL, suggests a phishing or social engineering lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6277

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/kVSxLQpkboc/square?utm_term=macro+calculator+for+weight+loss
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e940fcb630645a0ef855d6/1625899260192/55451530311.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8340e8ad60325f0c9ca8f/1625830414214/tejipusififamegik.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94ec6c0906550d90ca3ac/1625902791083/lcm_of_15_18_27.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_off0000d5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16792 bytes
font_01_sfnt_off0000ee09.bin
bd93358f906db19447cf0fc76bb53bf768b96909ab0b464a5f4254489c78b887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 10688 bytes
font_02_sfnt_off000106c5.bin
3d22269b274701497fb7b2285b60be8b926882e394492bc9c908035c5f77e88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 15920 bytes

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