Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f80553582e722ef…

MALICIOUS

PDF

74.8 KB Created: 2021-03-08 15:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 810494a8a714a78bbd36fa5e7b8558d8 SHA-1: c4fd9fc8fe64c83d909bba7695eb0dcca1632989 SHA-256: 9f80553582e722ef8dadbdbcfc9fe8909bc2cced7d05c95b36a5cb79ee2d3318
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm designed to distribute SEO spam and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous external links, including one to 'konomubexidop.epizy.com', which is part of a link farm hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=how+to+calculate+the+elapsed+time PDF link annotation
    • https://cdn.sqhk.co/gozigawefo/PI6ijS0/masterchef_son_fragman_2020.pdfIn PDF document text
    • http://sijazoge.iblogger.org/microsoft_firewall_protection_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/bjcjgXs/burger_shop_3_free_download_for_pc.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/value_of_education_file.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/22gc4DA/warriors_of_fate_2_ps1_download.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/jipPheF/nsw_off_road_racing_calendar_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/hjScxWo/49053030563.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/9519282.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/bijgiR0/bonimokitagexenubidutobej.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/hdLjtHj/pozoxarisolup.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/5887c69032136.pdfIn PDF document text
    • http://gawaxoxirerefi.22web.org/how_will_higher_education_change_in_the_future.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/d2dbca7873825.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/2241807.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/are_all_in_one_car_seats_safe_for_infants.pdfIn PDF document text
    • http://gisujug.mypressonline.com/34678819145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konomubexidop.epizy.com/xabugerusanoveg.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/informatica_bdm_tutorial_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14fa7d3-9fd9-453f-bf33-1774d8b7d2d7/7_elements_of_music_dynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6381d2-773a-45fa-879d-a46c4c02771b/boy_scout_first_aid_merit_badge_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14d10f1-eddf-4f31-ab4e-a075f5a9c6ab/how_to_get_started_trading_penny_stocks.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/what_is_naturalistic_drama.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 5268 bytes
SHA-256: 74010c5e486ab9524ec4f0198cd669e99ff558ecb1a8c0bcb3f465b24b916831
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 10132 bytes
SHA-256: 614b9c3366148d9991d807d00cc718273e74733572598e7b7b63ea5097baf434