Malicious PDF — malware analysis report

Static analysis result for SHA-256 1188f38b49b95cea…

MALICIOUS

PDF

76.7 KB Created: 2021-07-12 21:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f270e3adf9b2ccbb7b924e8a216da78a SHA-1: 460af8ab09f2425ad969dee24c396783774e3352 SHA-256: 1188f38b49b95ceaa87b6438b7a6ac37663670ace7b45e2277bd18b42d7d3bd9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'medvor.ru', which is likely part of a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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://medvor.ru/square?utm_term=convert+png+file+to+pdf+free+online
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7cf897d3b385c94b51a11/1625804681361/population_explosion_causes_and_consequences.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec80dc6ad76c09748ff51e/1626112220582/10386271739.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec786c154eb17b6848e455/1626110060260/liver_ast_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec77e7c268f363b0859a23/1626109927832/15783659716.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e957e2b6271615aef3a/1626111637512/25727053607.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_off0000cd3b.bin
37db208e49d0a61f3fdb6f82991c0d5933eeeee15a620c2932b7dc1ea184b0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 10440 bytes
font_01_sfnt_off0000e4cd.bin
c381a18fb1284fe6a6535e2ee3ec31b804369f0a8e1670374bfa07e8774dfe21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 16160 bytes
font_02_sfnt_off00010ebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16792 bytes

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