Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2f3bd7660970bc…

MALICIOUS

PDF

106.3 KB Created: 2021-05-14 14:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 632e7948a57be6aa54600b3f4ab11089 SHA-1: 8b199e79b58be26366ecf8cfc128fe2bacf859fe SHA-256: ce2f3bd7660970bc8692b0e40748d872a88a0fe61fcd35be75f0569f3a14cb71
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jumiwimov.ru/strik?utm_term=the+power+of+one+chapter+21+summary
    • https://cdn-cms.f-static.net/uploads/4451220/normal_602fb8b3548df.pdf
    • http://xegazinijitup.mywebcommunity.org/grundig_s350dl_antenna.pdf
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5fecc77027f99.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_6039ee624b2af.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_60643473dc7db.pdf
    • http://lotupojaxuvutix.mygamesonline.org/meruretufidaji.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_603a446d4f980.pdf
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60511d1719485.pdf
    • http://vurujupafowutox.mypressonline.com/72805537065.pdf
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5fcba30d63a05.pdf
    • https://static.s123-cdn-static.com/uploads/4414866/normal_5fe1d633c9de3.pdf
    • https://cdn-cms.f-static.net/uploads/4498834/normal_5fe6ac6bb5418.pdf
    • http://najetaxu.mygamesonline.org/pedibegimubazedatiwuwebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/07a954cd-683f-4a6f-b7e5-27cfe1862fb0/a_time_to_kill_book_pages.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_54bf3cdd1e5c4ae8bcaa81b0ba2d4bc1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14ded859-041a-4c69-bf45-db008f38b73b/cost_to_upgrade_adt_system.pdf
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_bee8f8efd1ce47e5b15cdc89bfa7b7ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f865cd88-f145-45e6-a7d0-8a0502296bae/gevixavekatezidofisuw.pdf
    • https://uploads.strikinglycdn.com/files/44d4da9b-1f99-43cc-8cd0-571dfdaf3627/64596337510.pdf
    • http://zepizevut.atwebpages.com/mapamundi_con_nombres.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_921326e464184c2c84dda1ca1ca1ac72.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee2a33e6-57c8-47e4-a9c0-6f5b63675c64/philosophy_of_science_association_journal.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_5d1feee0150742b8bfce2043d9e439e8.pdf?index=true
    • 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
    • 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_off00014ec0.bin
456a1c0e9edb4d2e9259f0ef188cb7caf70baf89b2241c836d856c33a6d599fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 5552 bytes
font_01_sfnt_off00016197.bin
73d2f147753ea8d06a02955d10e994aa89a7a23b81c3808ceeaf1d259b6eb073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16197 10508 bytes
font_02_sfnt_off000185e4.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x185E4 16204 bytes

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