Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91dc0f36945e016…

MALICIOUS

PDF

86.9 KB Created: 2021-04-16 20:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 65d1d4236fc620eff89bbf1a21ad3189 SHA-1: a3e96042780891ef3122821008a6e15e8afca5c6 SHA-256: a91dc0f36945e0169ab6ffa0b6a51dd7bcf3fe27d93b13ed276a18fd7dad3791
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a machine learning classifier indicating high maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or malware distribution scheme. The presence of a malicious redirector URL indicates an attempt to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=dewalt+dcd771c2+20v+cordless+compact+drill In PDF document text
    • http://jolixasij.sportsontheweb.net/ziwoboxebuw.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/dBieBuA/58323068354.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/ganazipapejeraresaxixi.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/parotaxunugudixivadekoja.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/cambridge_english_empower_c1_descargar.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/derulebapenepovuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_605d2ef966935.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/bepajiripazowug-zujuwumebido-loganatoneme-zosolomuxon.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/food_and_beverage_manager_resume.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/alphabet_handwriting_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/57rwiet/tv_series_ringtones_free_download.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/tidinaruw_tesawifibibezaj_nobonetapul.pdfIn PDF document text
    • https://vujemojijub.weebly.com/uploads/1/3/3/9/133997462/zenogizusujokiruz.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/toshiba_ct-8037_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/jomurozop/hG3ggua/toxirepumanekoriz.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/7268197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fdfce3c5e2e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fc9163e9ca5b.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/hhKQNmG/1v1_build_battle_games_online.pdfIn PDF document text
    • https://rerevuvoruta.weebly.com/uploads/1/3/2/6/132682210/eb6dacf16a2add.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/dufozoxotevavipif.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/ontario_ambient_air_quality_criteria.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_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 5776 bytes
SHA-256: a70e349bd9721b1b126ff89f76e85f8d0874cc2ccc0b5ffbddfef99c379f3b49
font_01_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 10548 bytes
SHA-256: 1141a6eaf8bf0bd6ea45fe9ce77927d71913a832a533da7c9866ff0a393e96a9