Malicious PDF — malware analysis report

Static analysis result for SHA-256 024f73c0a0f6608a…

MALICIOUS

PDF

124.4 KB Created: 2021-07-13 18:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ec64714bbfa9274d5d7b0df9e28522b SHA-1: abd8a0bbd4f5a0328f7af8e9e8153be9f73126c5 SHA-256: 024f73c0a0f6608a4400c0541918dac7a7b634e7619fd0c0ccb3f27f5d503154
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 heuristic indicating an external URI. The embedded URL, https://medvor.ru/square?utm_term=modified+barthel+index+form+pdf, is likely the primary lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6639

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://medvor.ru/square?utm_term=modified+barthel+index+form+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e82372efb14d11221464f8/1625826162386/red_and_purple_together.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c0bdb825900159c1e1a5/1625866429133/lusagivijuzekalavu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed2dcc2ae47d2ac91fe172/1626156492944/27667542810.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7ba0857d2352c927a9210/1625799176468/is_dry_yeast_alive.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7c0f480504e0a776803b7/1625800948434/k_on_characters_mio.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_off00018627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18627 16792 bytes
font_01_sfnt_off00019e3e.bin
72b507cddef5492a0c970f55e5deea798b7fb8b853522bafd0417dfff3aeb68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E3E 10832 bytes
font_02_sfnt_off0001b6c5.bin
cf8c32dc5083bd31085d3dcd5186f0ee0bbbd5cf4f1374756733d4d368cd00e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C5 17692 bytes

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