Malicious PDF — malware analysis report

Static analysis result for SHA-256 d759bbfb0fdfea09…

MALICIOUS

PDF

90.6 KB Created: 2021-07-13 22:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c69e4c598a89489efaf98c1cf2c60b80 SHA-1: 7401d163287cf3d429ea01369bd01266e201b918 SHA-256: d759bbfb0fdfea094eb1013ab22338525db82b1d63ce8d662d1bd2e36cfde22e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'coretry.ru', which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8172

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=types+of+commercial+loans
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8f32c81c37306b2f8744/1626115890543/ropeju.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94d97f492d21a0f6c3a53/1625902487371/mean_formula_in_terms_of_median_and_mode.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9440b0cbdad4d3506dff5/1625900043366/52149912.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7df137e45264421f8d9d9/1625808659540/salmon_from_the_bible.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed938ec50d503b9d59ef4c/1626182542457/courgette_for_baby.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_off00010225.bin
e92df47ad70112ca0c9b7fa61ca8c45ba8354bfab605557f6b994316ae3cbf00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 10620 bytes
font_01_sfnt_off00011a6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 16792 bytes
font_02_sfnt_off0001327f.bin
65851850321997432eb162ed1b01ba7e14bc1efda99802adce312ca084c69531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 16992 bytes

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