Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d9ec365930f8a…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 20:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41a3f3b8cee806b04a452a673ff73f38 SHA-1: 030aad168e0b6a07dada564f40a46dea82f149f1 SHA-256: 790d9ec365930f8a8a6faee65951a2ca2b9d22f19d9a8bef88198d3e0f0eeafd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of many suspicious URLs suggests the primary attack vector is directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=kinetic+energy+worksheet+6th+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452850/normal_5fcbd09a396cb.pdfIn PDF document text
    • http://indital.fun/72178806881vsv4q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_605ae29e1f000.pdfIn PDF document text
    • http://legko.travel/xobaxuwufowbk5w2.pdfIn PDF document text
    • http://mini-cam1.club/how_to_work_a_walgreens_humidifierdmbpq.pdfIn PDF document text
    • http://circus.market/nanda_nursing_diagnosis_2015_to_2017ljq2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_601ad7cb33311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_6063e938cae95.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/forukofu.pdfIn PDF document text
    • http://reduslim-ordina.site/pathfinder_magic_weapon_costtbbqe.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/23171371418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5fdcf49ff2a6e.pdfIn PDF document text
    • http://deutschebank-meine.com/gerabefuypa4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_60420850814c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd1720ee0d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_60242118056d4.pdfIn PDF document text
    • http://chambreapp.xyz/47661584349zsito.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/gugumenije.pdfIn PDF document text
    • http://look-hotel.com/husqvarna_weed_eater_128cd_attachmentsokxl9.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fd654b7ad1d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekamidakoj.atwebpages.com/gavuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa383664-a4eb-48ec-88d8-c669beb730a5/historia_de_mexico_desde_la_epoca_prehispanica_hasta_la_actualidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1985931-ac55-40c2-ba30-89aff8536e7e/cashflow_quadrant_game_online.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/are_burger_king_chicken_nuggets_still_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd1326-0681-463b-9447-b67e0e8906d0/derawafoselipurazijiwomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a7255c-91a2-4c8e-9885-ddc2ecb3f120/homemade_tubing_bender_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6591070a-a54b-4228-bc67-9150cc875094/78974601282.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_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 5548 bytes
SHA-256: 00034aa3d924d550ac09478a82aee1efca5df240716b763780c81d7ff3b02de7
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 2536 bytes
SHA-256: f6b1df63fe37622969e2da94fc84033336617f2bb88ed9efb770c575f9b4880d
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 10916 bytes
SHA-256: 6aad5c4acf171abe40f0c8a3ee8ef1ac653dd3ca9562d11cfc04da2ab2c632a6

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