Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfabc993346fe279…

MALICIOUS

PDF

79.5 KB Created: 2021-07-16 05:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beb7adb18599d6ce97bbc7cc17be804e SHA-1: f75d632b094a234dd281c75ea52dc5788c9f531e SHA-256: bfabc993346fe279f304a1de743cc016743839e88c74aa9e033f3f87a1826480
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An external URI, 'https://chcial.ru/square?utm_term=biology+dna+test+answers', was extracted, indicating a potential phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URI suggest a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8511

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://chcial.ru/square?utm_term=biology+dna+test+answers
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d29e64ce537163430e5/1626111273879/castle_crashers_pink_knight.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0c0335554232196b694c5/1626390579778/24498542532.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e94b86c4c1a734c5d83242/1625901958665/psychology_maslows_hierarchy_of_needs.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee91a22485902f3e77dd08/1626247586997/lincolns_plan_for_reconstruction.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed8e866b40a9602c98b718/1626181254284/dakejokodupasakixewe.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee620ddf3d323292d2e978/1626235405868/gisipipawoti.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_off0000d6f6.bin
1406908798bf2124d8a0a57dc37ed40cceefb4189ac4ad94267a020a930cc4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 10676 bytes
font_01_sfnt_off0000ef74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 16792 bytes
font_02_sfnt_off00010786.bin
2f8459cad99a6130331deac77d8089bebaa3bb64535045d33bd11bca9b09b928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16540 bytes

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