Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f8181b3bda1456…

MALICIOUS

PDF

81.2 KB Created: 2021-05-07 11:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dba3fbde2dbc8b09ded48a4c55f43ba SHA-1: b36028c1d8c14e47b86c16e83c057a1a8f74cad7 SHA-256: f9f8181b3bda14563d52777137bde38e4c6b7540415245c2b469ce66c879ddbb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary IOC is the malicious URL 'https://pelibifir.ru/strik?utm_term=another+word+for+listening+skills', which is likely the destination for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/strik?utm_term=another+word+for+listening+skills
    • https://cdn-cms.f-static.net/uploads/4465128/normal_60245157e250a.pdf
    • http://komozazene.getenjoyment.net/biomedical_engineering_fundamentals.pdf
    • http://labifovejes.mypressonline.com/barbie_house_decoration_games_play_free_online.pdf
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fe7597fcc98f.pdf
    • https://cdn-cms.f-static.net/uploads/4426071/normal_6046e2a6c8161.pdf
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/jojuvuwewomumebada.pdf
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5fe4146f1b350.pdf
    • https://cdn-cms.f-static.net/uploads/4445331/normal_6051cd46a1dc6.pdf
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/xebofe_jowemabetemova_repoxukewaruga_dofoke.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_6059c835be58b.pdf
    • http://devuweza.scienceontheweb.net/35078966486.pdf
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/94fe921.pdf
    • http://luziniwanemek.sportsontheweb.net/rulaj.pdf
    • https://static.s123-cdn-static.com/uploads/4414514/normal_6000d1d54cae0.pdf
    • https://cdn-cms.f-static.net/uploads/4457572/normal_6064336d1b6ca.pdf
    • https://jilolepileg.weebly.com/uploads/1/3/1/4/131453494/5737fa3decd994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7c25add7-abbe-44b6-a24c-c0d8c1925a5e/notaborogiwimanop.pdf
    • https://uploads.strikinglycdn.com/files/1089c9cb-1459-41df-bbeb-0c2f40269592/kegimuduva.pdf
    • https://uploads.strikinglycdn.com/files/d2bd0d79-225a-4666-bb3a-57e6b14a34a2/wixubatabafofav.pdf
    • https://uploads.strikinglycdn.com/files/d9efb02a-918e-4b4c-95af-2e20e4affb22/12712993818.pdf
    • https://uploads.strikinglycdn.com/files/3f18b194-556b-4f5d-b346-95b7152bd962/who_are_the_main_characters_in_the_christmas_carol.pdf
    • https://uploads.strikinglycdn.com/files/6ec34b27-8dac-493b-a0f6-cf38d5f245fa/mipixodenogobopedemezo.pdf
    • https://uploads.strikinglycdn.com/files/042af140-2b55-44ab-81d4-c5562a9e3613/cancin_de_hielo_y_fuego_el_juego_de_miniaturas_contenido.pdf
    • https://uploads.strikinglycdn.com/files/e5898670-0bd4-43d8-a0f5-eb419f978432/34559914126.pdf
    • https://uploads.strikinglycdn.com/files/24e53796-b54c-4aee-a9eb-18926c9aafc9/how_to_fix_kenmore_washing_machine_agitator.pdf
    • http://sajulugebimisu.myartsonline.com/1789577715.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_off0000fd7b.bin
b9273ae49f05f48b922c098f7246c5254f828299daad42d207257724db328e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 5104 bytes
font_01_sfnt_off00010ee9.bin
6949b4cf9f90c3652d583f69e265e19cbfc20efbd65c68bb42bce35e13844f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 11392 bytes

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