Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e939bf19a25676…

MALICIOUS

PDF

67.9 KB Created: 2021-03-09 02:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0e8cd36d93ab0e566389b18f10a688 SHA-1: e47f1183f0821910c0a398440b88a13c80540ab6 SHA-256: 72e939bf19a25676fdccca3c5312bf1601a1062f5e2e80ffd35c23971e4b45ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, with one pointing to 'bologen.ru', suggesting an attempt to redirect users or manipulate search engine results. The document body is heavily obfuscated and appears to be corrupted, preventing a clear understanding of its direct content beyond the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=samsung+rugby+manual
    • http://strgb2.ru/how_much_is_a_2006_toyota_sienna_worth3mui9.pdf
    • http://kaxiwemusemoj.mypressonline.com/physics_chapter_3_study_guide_answers.pdf
    • http://roman-holidays.shop/34260622027wgchb.pdf
    • http://avto-document.site/sazuzovabewopekhc9q3.pdf
    • http://kogutojoveso.mywebcommunity.org/84457170106.pdf
    • http://zosuwalerikare.getenjoyment.net/dipomisederagunasuvabap.pdf
    • http://suguxilaxiz.22web.org/vatagegotixuveremir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xinovedef.rf.gd/us_army_enlisted_ranks_in_order.pdf
    • https://uploads.strikinglycdn.com/files/1dccb7d1-7731-4a05-b9c1-a9308a14bc75/optiplex_790_specs_sff.pdf
    • https://uploads.strikinglycdn.com/files/177be7ce-da64-4a8f-9664-055f9aa366f2/85250761506.pdf
    • http://nalumilejoburo.rf.gd/67548700966.pdf
    • https://uploads.strikinglycdn.com/files/ef7f16c9-9148-46d6-9eda-bd4faffa7107/30584195982.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a93c2f04e2594ddeb72b6180098aecb0.pdf?index=true
    • http://faxumev.epizy.com/ethiopian_music_video_clip_mp4.pdf
    • https://uploads.strikinglycdn.com/files/3ddc924c-de2f-43f3-bea2-cf3f11cac629/tokyo_ghoul_kaneki_vs_jason_chapter.pdf
    • https://uploads.strikinglycdn.com/files/72f2e75d-6669-4721-84e3-996d17486656/reading_comprehension_worksheets_6th_grade.pdf
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_aff15c5de8c541ff99fc3dc76fb1e4eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eaf86fe1-47fb-4091-a4bf-8ebd52874044/dating_scan_accuracy_8_weeks.pdf
    • https://uploads.strikinglycdn.com/files/53729bcd-ea77-4284-8d7a-c5816838927e/81458995375.pdf
    • https://uploads.strikinglycdn.com/files/03f7f8bf-eb54-4ded-987a-1ab546c7a9d1/wilifofeped.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_off0000cd4c.bin
1f8c4e012b5c2042552e75d15cb4dfd345ea8b65d02808b186281d2fd2c28fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4C 5352 bytes
font_01_sfnt_off0000df6e.bin
dd4983b7dc7bce9bdbea173f82029e71e426be9ff6d45f884ded81a9bd15eb2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 10268 bytes

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