Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8503d91e8ce641d…

MALICIOUS

PDF

73.7 KB Created: 2021-07-16 05:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cea95b6a4c34d2c9f5115099426eb9de SHA-1: f2dc099f1fceccdd8b400f132115c8cdb9bc8ed9 SHA-256: b8503d91e8ce641d13f2990abb9f5b5aa11fd929147a2db0679b3121789069bc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a machine learning classifier and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect users to a phishing site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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://krisoc.ru/square?utm_term=switch+positions+crossword+answer
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0c6994bb49071de13e121/1626392218139/how_to_merge_excel_data_into_form.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e94eb30a287971af9b55f5/1625902771846/pop_songs_to_play_on_guitar.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0db908ed7c6554e779111/1626397584879/haworth_projection_of_fructose.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edcd13e7c05a535254d8ed/1626197267966/39383174336.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0d681425b7b7417813dab/1626396289413/burezagerasuseveged.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76a51a44c0067aae6241e/1625778769257/the_equalizer_2_online_stream.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_off0000c0df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 16792 bytes
font_01_sfnt_off0000d8f1.bin
b15e93cde7e4a21783efc515b9f07c73b36ac5ea39d91dc6f67f6f7de12053bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 16024 bytes
font_02_sfnt_off00010250.bin
b132c444196c5b51dd9c6a29e031c5052d6e5654d5446196e517fcf1b9b937f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10728 bytes

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