Malicious PDF — malware analysis report

Static analysis result for SHA-256 857f2d6ac321e82e…

MALICIOUS

PDF

76.9 KB Created: 2021-07-15 19:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfde8f913ee604b225597b5d62eed8d2 SHA-1: 4734f24b2f4d4d7b0d29f485a768c9f12ea5e9f7 SHA-256: 857f2d6ac321e82e82123f9c496048a8ebd154ae3ebed9f0e601999da9870fee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'wastran.ru', which is likely the malicious destination. No scripts were extracted, but the presence of the external URI suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://wastran.ru/square?utm_term=example+of+order+of+adjectives+in+a+sentence
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e77680b9d0dc543c0b1480/1625781888373/dukukakuvexobekusijerowo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f057fcb514222d3a52d638/1626363900754/dickinson_county_treasurers_office.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e796f338ed220952a97abc/1625790195639/white_nose_syndrome_cause.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee35512d09e34b729fc056/1626223953246/xijuz.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecab8be0914637f38ed097/1626123148070/lucifer_cage_the_elephant.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_off0000c97b.bin
9fe2da70d30470667bd4d084c28b2c594b2c92343bfaa0b67d0e748d8157a178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 11064 bytes
font_01_sfnt_off0000e332.bin
f5b2ea1b27960e5b8aa65fa304ffb3ec9626d6455387186fe5b0546f16803f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 17032 bytes
font_02_sfnt_off00010da1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes

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