Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7b2411a5f95ef4…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 07:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c5c2cc111adde8d2eac2b80c53eaeb47 SHA-1: c63f494b923e598523c79e61d0de1ffa55c4c0f6 SHA-256: cd7b2411a5f95ef4959156f46296ce721314e6f3f94265613770d39973d2e048
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=area+of+sector+and+segment+worksheet+1 PDF link annotation
    • https://cdn.sqhk.co/kezavilageg/bieGgjg/download_extreme_car_driving_simulator_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/ieU8ies/71000258045.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/suxemubove_mepegulafixivul_tebalav_taxowotewafun.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/spL7rjj/swot_analysis_of_one_s_personality.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/3d344c5f5b1.pdfIn PDF document text
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/33ba610.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/6948945.pdfIn PDF document text
    • https://cdn.sqhk.co/jokusagin/cgmghkX/mejuzezoxunis.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/hajggif/barrett_jackson_on_tv.pdfIn PDF document text
    • http://gemajesubon.22web.org/jezuzevulojoparefax.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/jjiHHib/95828187349.pdfIn PDF document text
    • http://sluzhba1.net/likowoloyi2q1.pdfIn PDF document text
    • https://cdn.sqhk.co/nawinirezuj/p5hjQjc/75357502097.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/EcSifiF/safomuvoxezike.pdfIn PDF document text
    • http://azakalaza3.xyz/85807396187c12n4.pdfIn PDF document text
    • http://nadipasigisapup.22web.org/wofunepobubudupigak.pdfIn PDF document text
    • http://infokurs.design/jovomozeraroxesokego3zirr.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/72843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c53b44d-62b3-4f5d-85bf-152a77ead989/the_tangible_kingdom_primer.pdfIn PDF document text
    • http://pekudus.rf.gd/steam_game_speed_slow.pdfIn PDF document text
    • http://nenizumudi.rf.gd/48929433469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75b7bb9-6b04-4868-b3a0-36d2253a09a1/a_level_biology_edexcel_topic_questions.pdfIn PDF document text
    • http://pofulexurukuka.rf.gd/yard_yahtzee_score_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9c7686-6c5b-472d-9c83-15cf63765427/bijevafomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe91b8a-24ec-4168-af61-aaf190394a56/58410709660.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 5600 bytes
SHA-256: 574f69e6761cee4f9443037f4ef8de09f6b3f51e500dc54e63b09677d5ebe3fa
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 11392 bytes
SHA-256: 1c4889ad0178b6f92b0b67376790c826ffc84f9ad1478e0be52a19e583f38b91