Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5a175eff2e019c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-24 10:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4180dbc364d5d3acd841d58aeae92b2b SHA-1: 72ff4e7466d8bfc39994ad934c897053a968ef08 SHA-256: 9c5a175eff2e019cf8e249f3f709d120a5b5ba1c069177160e1c89d4ccb7b62c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://maypoin.ru/strik?utm_term=ti+84+plus+silver+backup+battery PDF link annotation
    • http://nazorizuz.medianewsonline.com/statistics_for_spatial_data.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/zuvevegad.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/rupawogijesapaxokolevumo.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/80237812073.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/how_to_estimate_usps_delivery_time.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/lalaropupuk.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/teacher_attendance_register.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/xusizixi.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/10060000061.pdfIn PDF document text
    • http://trend-sales.fun/pneumonia_treatment_guideline_idsabeyyy.pdfIn PDF document text
    • http://arm-watch1.club/what_are_the_specials_at_long_john_silversz6ab9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuroruwe.myartsonline.com/xaramola.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/jikapipigomop.pdfIn PDF document text
    • http://mixaluzosibad.rf.gd/14327132236.pdfIn PDF document text
    • http://purezaviwof.myartsonline.com/best_part_daniel_caesar_sheet_music.pdfIn PDF document text
    • http://famekuputoda.myartsonline.com/telephone_billing_system_project.pdfIn PDF document text
    • http://maxefaronuxugur.epizy.com/operation_of_municipal_wastewater_treatment_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/new_monster_high_movies_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/4604887285.pdfIn PDF document text
    • http://solezod.myartsonline.com/fovijunawidomawekenedo.pdfIn PDF document text
    • http://gikutixutawax.epizy.com/device_management_buffering_in_operating_system.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/aachen_city_map.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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5524 bytes
SHA-256: 252c05ac9e123c402b86602af1a5d24d25f28abc024ee8b14891fc3330d36fd4
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 12140 bytes
SHA-256: 721956605a641a8111817dc49f8910f0aa0695f89bfd75fb38d60886c2666bda