Malicious PDF — malware analysis report

Static analysis result for SHA-256 979c2ae01919e365…

MALICIOUS

PDF

90.8 KB Created: 2021-05-20 11:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8898a2bed2dea5a445d17534b021bc76 SHA-1: cb08ec6f4d32e35e378682581fc39c507da3e9a7 SHA-256: 979c2ae01919e365fe3300069694cca7914c7dddc0886e36d5ac7e525f151f52
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=buku+fiqih+thaharah+pdf PDF link annotation
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/5275970.pdfIn PDF document text
    • https://neloramobipetez.weebly.com/uploads/1/3/1/4/131407165/1915758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_603d1591e9218.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/naxesu.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/puregimaji.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/lobabelemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_601f9925716b2.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/vixixixuwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6014fa1c8cc41.pdfIn PDF document text
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/kegeparomaziwi_busagijatamix_xaxezalujizaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_601c8e819dcc7.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/f9878a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_60207fc7cad8a.pdfIn PDF document text
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/mavewenu.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/vilodibunazaj.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/1a92dd.pdfIn PDF document text
    • https://kajavowonedefa.weebly.com/uploads/1/3/4/8/134858644/fenadawojevex-xokogoj-detotur.pdfIn PDF document text
    • https://fonutupo.weebly.com/uploads/1/3/4/7/134727000/5859670.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/16728cb4-f4b6-40fc-8dc9-5110e43e840a/how_to_install_mr_heater_80000_btu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438b10a0-dd44-4927-8405-a20516e1d4fe/how_to_make_a_minecraft_server_no_hamachi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912d5d2e-e31d-44b6-a295-e92037d8c433/como_usar_una_maquina_de_coser_brother_ls-2125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b696efc-a9bc-4f94-b86e-fe99d678909e/can_i_get_my_ct_real_estate_license_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d7661f-6157-4e99-bed5-7ef25ffbb51b/94224397167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198e8735-fb8e-4026-be92-2562125075c0/91074744120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7afabc9-de0b-44b9-9c94-65bffb68cefb/85571057995.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 4708 bytes
SHA-256: 322c643c00f47b150dd8aad1914e0df72c5c1268ce8b6026d1aee6802ad26f75
font_01_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 11556 bytes
SHA-256: ecff4a0acd3af38361bad672a9fd8344155839c76e363284adb974d70e16370c
font_02_sfnt_off00014f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F86 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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