Malicious PDF — malware analysis report

Static analysis result for SHA-256 34483c08421bb6b7…

MALICIOUS

PDF

78.2 KB Created: 2021-07-13 19:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 731cee3512823995b89aac0438dc04e9 SHA-1: a69b360279eb10f0645b267fb58702a3e3ffa39a SHA-256: 34483c08421bb6b7d7f968d9b724a890ab833cc0da45b0de37c1bd571eed729d
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 'https://ketchas.ru/square?utm_term=anthropology+and+education', which is likely part of a phishing or credential harvesting attempt. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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://ketchas.ru/square?utm_term=anthropology+and+education
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec90ad4f558d0bf39ccd15/1626116269529/45079434657.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e925e8320dbd0de281339f/1625892328412/tezajuzakukigukodeporagep.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7f5eed93aeb546a15994d/1625814510381/patient_outcomes_for_impaired_skin_integrity.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecaca9704a383bbedd9d21/1626123433622/windows_10_tips_and_tricks.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e825391c6ee137fa13bbcc/1625826617336/here_i_am_waiting_for_this_moment_to_last.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ad954b964f05b845a7a3/1625795989806/kinaden.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed942fcd0cb17c762de5cd/1626182704087/luluxupipofusopodiboleko.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_off0000d283.bin
5c4acfc80e5764026ed11d32d3736589c7b624133c59c1c22f54860a20ae1983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 10820 bytes
font_01_sfnt_off0000eb38.bin
81705e207fcf35a238c2d5fc88b30227e846f13d7b2342dfd7b6866667e07502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 16336 bytes
font_02_sfnt_off0001150e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 16792 bytes

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