Malicious PDF — malware analysis report

Static analysis result for SHA-256 39658730b9d55d76…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 01:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f10aa5691fd566132232ea60e7e2a6c SHA-1: 5bb9f96f022076ade3eaf560ea3e413ec8d25e91 SHA-256: 39658730b9d55d765150c584b15ed0df49034e58c9ac84a512bc0863a7c96d52
104 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The presence of an embedded URI pointing to 'lozipotod.ru' and a heuristic indicating a visual download button lure suggests a phishing or social engineering attack. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'autocollimator principle pdf', likely serving as a pretext for the malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=autocollimator+principle+pdf
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6028804667232.pdf
    • https://cdn.sqhk.co/temirikuji/u1Aide1/design_my_living_room_app_free.pdf
    • https://cdn.sqhk.co/datolabevev/5hf3xVJ/monkey_meme_pfp.pdf
    • https://cdn.sqhk.co/wanevakaxuma/bqziiAp/ziwafewamomutit.pdf
    • https://cdn-cms.f-static.net/uploads/4495034/normal_606b73073411e.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_605c74749d299.pdf
    • https://cdn.sqhk.co/wojipezusax/ggMgfc2/76695619103.pdf
    • http://lemiritafuwab.22web.org/keluxexoxepujazonazi.pdf
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5feca1ececdc3.pdf
    • https://cdn-cms.f-static.net/uploads/4368772/normal_602a41c138a6c.pdf
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffe528246f9f.pdf
    • http://zimefob.22web.org/69691123950.pdf
    • https://cdn-cms.f-static.net/uploads/4377938/normal_60252800e9651.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a1d77615-6668-406d-83e7-ed8d3923e367/el_lazarillo_de_tormes_espaol_moderno.pdf
    • https://uploads.strikinglycdn.com/files/fa58f436-c2a4-4d07-b06e-e8568cc4fd02/wulifetobokawigu.pdf
    • https://uploads.strikinglycdn.com/files/feecaaea-d57b-4705-bbe8-ba0b7941e2f3/financial_markets_and_institutions_9th_edition_solutions.pdf
    • https://uploads.strikinglycdn.com/files/1476d376-8b0b-4763-af01-65546eda4e67/zitabupogimid.pdf
    • https://uploads.strikinglycdn.com/files/3f92ff48-5e1d-4dec-9dbd-d8bc2948cb00/mipamidezemi.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_off0000e859.bin
c63fa40f5236e1da7027179a058b5954927baa1cf361365ca15b6c5fcf85f138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 5112 bytes
font_01_sfnt_off0000f9a6.bin
83252db89e2e7ee73b7dca6b814304c5a379decb5adc9e7a3dba73a4b5e471fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 11416 bytes

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