Malicious PDF — malware analysis report

Static analysis result for SHA-256 8705e1e356fbeaf9…

MALICIOUS

PDF

102.9 KB Created: 2021-03-16 21:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3ec647958dd842daccacbe29b9d184d2 SHA-1: 54fc287a7bff5ca5300d219c45a47d14af2b6901 SHA-256: 8705e1e356fbeaf9c01bbe24b06cd82bc1fd6d602f4f37da3f7a5f804daadc3e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm hosted on disposable infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection further confirm its malicious nature. The primary purpose appears to be directing users to potentially malicious or phishing content through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=fe+grab+knife+script+pastebin+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_5fffc9de488b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_604d91bcd11be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_5ff844ed43adc.pdfIn PDF document text
    • http://purumobakeleju.22web.org/tarzan_adventure_games_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_601b526fe3490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ff25da093ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fe7016430815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5fdd6ff04dccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_60196cc27fcd1.pdfIn PDF document text
    • https://github.com/Mokiros/roblox-FE-compatibilityIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavimefejemud.rf.gd/notacion_cientifica_ejercicios_online.pdfIn PDF document text
    • http://ledudixip.epizy.com/neruvedibirij.pdfIn PDF document text
    • http://zemofebu.epizy.com/management_summary_template_ppt.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/beginner_violin_pieces.pdfIn PDF document text
    • http://foxesixa.epizy.com/3484916984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd09166a-0f07-4a49-9759-02bf4a4c644d/is_it_bad_to_marry_your_2nd_cousin.pdfIn PDF document text
    • http://levasufut.rf.gd/limites_indeterminados_0_0_ejemplos_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e316b7bb-52f3-40be-84fa-d619bd28b34e/kipekowatoganepekakula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aab2755-47f4-4445-922f-0f858806dc19/kepejuguvusarosukid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2683dd32-8e6f-400e-953f-4d12f9e7e496/cisco_ccna_200-301_exam_cost_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1414bc3f-3913-4858-ae81-b6576c3b7717/vefobifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03419ea7-3e48-417f-890c-6ccd23741b00/nikon_n2000_value.pdfIn PDF document text
    • http://ganifexot.epizy.com/lightning_arrester_installation_guide.pdfIn PDF document text
    • http://ziriboxemo.epizy.com/neil_degrasse_tyson_masterclass_review.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15488 5584 bytes
SHA-256: cfd56e6c06228b4e7c311c0eb85676ac480d615b7318a45c809d9ae8a473cc97
font_01_sfnt_off000167a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A7 11096 bytes
SHA-256: 3a61960871b56cb1868dde3c0309a4be08d5231c8fddb6373808ca3612461253