Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec245239e17b9b21…

MALICIOUS

PDF

84.8 KB Created: 2021-07-13 23:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9b6f3ea1c5f04a1400645ba2e7a7f29 SHA-1: c93436822dfa04668f01e99cce70addbd4a42226 SHA-256: ec245239e17b9b21b120339255faa621008b98293a274808756184494328aaee
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. An external URI pointing to 'crewmak.ru' was extracted, which is highly suspicious. Although no scripts were directly extracted, the PDF structure and the presence of a malicious URL suggest an attempt to redirect the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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://crewmak.ru/square?utm_term=spac+sponsor+promote+dilution
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e946a6f492d21a0f6c0006/1625900710833/95398896174.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e85a1c93ef813e1d02929c/1625840157010/cc_timeline_song.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7cce152059f1ec1e37c50/1625804001863/pinacol_pinacolone_rearrangement_in_cyclic_compounds.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7e7eef29cd6423db4e895/1625810926894/4527477613.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7b513efb14d11220f3125/1625797907486/race_of_a_person.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_off0000e8b1.bin
da455651590ab420febf2bd4f37c1679bbb0b909a888b6ef24c6ef05c18a5112		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 17324 bytes
font_01_sfnt_off0001165a.bin
f6c588920932d687b23e3c3c9aafa4865336328ebef97ab835f2bc37194bf281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 10848 bytes
font_02_sfnt_off00012f59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 16792 bytes

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