Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d03bcbd78c0fd3…

MALICIOUS

PDF

77.8 KB Created: 2021-05-24 19:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0039bc6a0a704e10877961e6d60914fd SHA-1: 2a92a5c1334b7ae7672c4c1dc6b038e41f2dab7a SHA-256: a7d03bcbd78c0fd3a343e6053c4f082e082d81b20a522e1988c528e34586028f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The embedded URL and the document body suggest a lure to external websites, potentially for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://resalured.ru/wb?keyword=what%20is%20a%202005%20dodge%20caravan%20worth
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/xanafiz.pdf
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/xujokoluwajaveseza.pdf
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/4814525.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/ludigufiwim.pdf
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/3637117.pdf
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/ratazadusidobofigebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c165be39-d11e-4d4c-8163-95a422c42bdb/wejalovuvosi.pdf
    • https://uploads.strikinglycdn.com/files/b71993f3-2359-4fbc-893f-29732b81f667/rajixalulirumobeweviwuw.pdf
    • https://uploads.strikinglycdn.com/files/9a8aa21d-7e8e-487d-a216-7b44c3acb15d/bonaire_swamp_cooler_pump.pdf
    • https://uploads.strikinglycdn.com/files/87263553-5292-4916-ad63-d00289cfcf49/what_is_balance_in_the_principles_of_design.pdf
    • https://uploads.strikinglycdn.com/files/b01cf311-f821-494f-b1f6-2636fde9c898/wordly_wise_3000_book_4_lesson_11.pdf
    • https://uploads.strikinglycdn.com/files/77ffe639-bd25-4f3a-b4db-ec48dd6fda64/wirisejaxexetovipa.pdf
    • https://uploads.strikinglycdn.com/files/1ca02f85-bcaf-42b2-afe1-f79041594166/topolarixiv.pdf
    • https://uploads.strikinglycdn.com/files/65a2788f-3f2d-40c8-84cd-bf2aae6c3d02/craftsman_2_gallon_wet_dry_vac_bags.pdf
    • https://uploads.strikinglycdn.com/files/b40f90c9-b058-4d66-969f-08ecb05ec1b4/which_is_better_samsung_tab_a_or_tab_e.pdf
    • https://uploads.strikinglycdn.com/files/018163fa-3799-4839-9bb1-8a2962481d61/fire_and_ice_robert_frost_explanation.pdf
    • https://uploads.strikinglycdn.com/files/789a07c4-4eb4-4ba7-a496-f3e012f25413/95078497289.pdf
    • https://uploads.strikinglycdn.com/files/efd5eeaa-781c-485b-85f2-e0553f10accb/missing_numbers_100_chart_game.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_off0000f1af.bin
218ad8f0feb32190b2377996ae31ec089a24f8c1c6f0871d8bce5da9312450bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5732 bytes
font_01_sfnt_off00010553.bin
368be7907a5298bf9960108bdc582ae733c4e1d804db1dea701f33fceb62d6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10612 bytes

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