Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45e5c6c2f74b6c6…

MALICIOUS

PDF

74.8 KB Created: 2021-06-02 08:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0ca950c3129fcd25e8934e0259d6c7 SHA-1: 20d6eb5da7caff95bde0f015f79c82f80bb8b0f3 SHA-256: a45e5c6c2f74b6c64cc03cee664fc6d39bfcb07eae8a0ea2193906ab1cc26049
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains an embedded URL pointing to a phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically related to phishing. The presence of a PDF_URI heuristic firing on the suspicious URL further supports this. No scripts were extracted, but the overall structure and the external URL suggest a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=obstetrics+and+gynecology+nursing+textbook+pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/dirofopujelujujomi.pdf
    • https://cdn-cms.f-static.net/uploads/4378160/normal_6063a9b9c08ea.pdf
    • https://mobojifukan.weebly.com/uploads/1/3/4/6/134688158/8767559.pdf
    • https://cdn-cms.f-static.net/uploads/4465705/normal_6052b57ba6c6d.pdf
    • https://cdn-cms.f-static.net/uploads/4449788/normal_604a04ba0971a.pdf
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/6685963.pdf
    • https://xiwirananuwiro.weebly.com/uploads/1/3/1/0/131070481/3902571.pdf
    • https://static.s123-cdn-static.com/uploads/4380536/normal_6007bdd9b0532.pdf
    • https://cdn-cms.f-static.net/uploads/4455645/normal_60365e30d5868.pdf
    • https://static.s123-cdn-static.com/uploads/4367289/normal_5fec2f6ed73a8.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d875e986f9.pdf
    • https://static.s123-cdn-static.com/uploads/4467560/normal_60090ca9a90b2.pdf
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5ffad97087785.pdf
    • https://cdn-cms.f-static.net/uploads/4418171/normal_6062def1a986c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banusiv.pbworks.com/f/23552725327.pdf
    • http://bopelijexuf.pbworks.com/f/papixanofiworu.pdf
    • http://gazumadu.pbworks.com/w/file/fetch/144472965/b_n_c_full_form.pdf
    • http://lakebimutep.pbworks.com/f/39847104903.pdf
    • http://zufumegi.pbworks.com/f/4850760801.pdf
    • http://zowonixepor.pbworks.com/w/file/fetch/144465996/weguvopelajev.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144494292/dragon_ball_z_shin_budokai_6_free_download_for_ppsspp.pdf
    • http://laxaxufudej.pbworks.com/w/file/fetch/144488247/what_new_york_yankee_numbers_are_retired.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60b.bin
2b906599f12882b97190b85723bfb786aaee4aa8c8e7bea65dae0ece8415a5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 5724 bytes
font_01_sfnt_off0000f99e.bin
eabccdbdc0e5a866920f7d11a8cf594c5e5e37d0106adc9a55049812af651198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 10556 bytes

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