Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a94de777c82e74e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 22:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75fb3ccdf307bd80fe30baeb065dae9 SHA-1: 6132d8f91929c4ec5eb22b5ee53ac0243865e180 SHA-256: 0a94de777c82e74ee88b77c865e6e4f998c42ed32b799e385f9ab13f779d2453
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to 'https://coretry.ru/square?utm_term=structure+of+atom+class+9+chapter+pdf', which is likely a phishing lure. The PDF structure also shows duplicate object bodies, a common obfuscation technique. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4119

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://coretry.ru/square?utm_term=structure+of+atom+class+9+chapter+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e76fa14abb634903c8fc66/1625780129944/mopofapexutumilu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb48c46a7611a87d1a4ab/1626190988918/82422646277.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7167c8b0d544b6d5c2cf/1626108264203/kasapakog.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e4dd19a9f87deb6fbeb5/1625875677528/profile_summary_for_diploma_mechanical_engineer.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d449.bin
321598d707bf248d7eed6d0c230569edc2733d16e44390ce5a53feded3a48965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 11032 bytes
font_01_sfnt_off0000edfc.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16088 bytes
font_02_sfnt_off00010331.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 16792 bytes
font_03_sfnt_off00011b43.bin
8dae25d4cb9a968b903d0934946e7a3ba9a9dabe6403c5d2fea247a35d037b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 17196 bytes

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