Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d77fb47d46216f…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 09:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce1928226dffd6b12823ba18e8ae925b SHA-1: 891e60444b4a9061a5cbfc81a449cca2d2635bcf SHA-256: 61d77fb47d46216f41596a271998ebdc7ded08d9991626b6facbab4cce69c4be
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'bologen.ru', which is likely part of a phishing lure. The presence of PDF-specific heuristics and the ML detection strongly suggest a malicious intent to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=medical+abbreviation+dxt
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fe4d1a28297f.pdf
    • https://static.s123-cdn-static.com/uploads/4380080/normal_5fe48c395bf99.pdf
    • https://cdn.sqhk.co/xaranoraf/qgeECij/58386510460.pdf
    • https://cdn.sqhk.co/mujexoxa/dkjhdie/49779032818.pdf
    • http://mihetos.xyz/saitek_x52_flight_control_systemllqnq.pdf
    • http://vazawujuzu.sportsontheweb.net/96_ford_ranger_idle_problems.pdf
    • https://cdn-cms.f-static.net/uploads/4480891/normal_603599727584c.pdf
    • https://cdn-cms.f-static.net/uploads/4485828/normal_601f63de2bde3.pdf
    • https://cdn.sqhk.co/perigupa/hgSyYji/nefosubunelojubel.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/90ifhc9/neon_green_desktop_wallpaper.pdf
    • http://tupaxeguna.scienceontheweb.net/the_power_of_doing_less_download_free.pdf
    • https://cdn.sqhk.co/libibajuzumu/0jdgjVJ/airport_city_game_hack_version.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/polexebuj/lagu_mungkin_potret.pdf
    • https://s3.amazonaws.com/lodazojamuva/jimiwabigisezi.pdf
    • http://petojijoxura.onlinewebshop.net/why_does_my_sunbeam_heating_pad_blinking.pdf
    • http://wutejaxevewef.myartsonline.com/how_to_replace_s9_charging_port.pdf
    • https://s3.amazonaws.com/dixaleko/full_size_fitted_sheet_pattern.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_off0000ec1b.bin
15056006f22cbda41e78c6839fd0d5cdda68dd1181db25b4b7fac221a1c3e064		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 5028 bytes
font_01_sfnt_off0000fd57.bin
38d8983c03593e8aa443c64de7a93e11419a8ec2dc6fcac3fcecab19b442986e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10904 bytes

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