Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5c8db6175b256…

MALICIOUS

PDF

84.2 KB Created: 2021-03-08 09:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 96392393ec5503db30d43533a6707a9e SHA-1: fafa0e31b8bf0c48ddd94196c76421b18c14926e SHA-256: 8ca5c8db6175b25664917a48d15085989f1206b6ee7f972c61990a603a9d88e5
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://gimoguvi.ru/strik?utm_term=why+does+george+kill+lennie+quotes'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and embedded URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=why+does+george+kill+lennie+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fd3238901373.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/jeigExF/95816940732.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/5hcxcNH/ice_climbers_smash_ultimate_combos.pdfIn PDF document text
    • http://medtechnika1.ru/jump_rope_plank_workoutdi1nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60266b3a534d4.pdfIn PDF document text
    • http://latuha.com/parallel_circuits_practice_14._2_answerskx53i.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/ig9bCUC/zombie_scrapper_switch_review.pdfIn PDF document text
    • http://phillipen.online/papeluniputeturogevab47uhc.pdfIn PDF document text
    • http://pristav.pro/lufaxifogumefafudomze53i.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/hcg5Yjb/futizaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxegaxujifo/PTgegiH/wild_police_chase_south_los_angeles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_600f2dbc78ba6.pdfIn PDF document text
    • http://daimontimur.org/70972059485qq9c8.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/lafevavuj.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/9be4cfdc-0b62-4bfd-9760-780f60fe57d9/difiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/doberewugitamemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924c7dda-b334-4565-9f02-1221f6b80613/rebereluxazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e881d00e-1258-4f15-ba57-df59e06edb79/rikujeratizu.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/36002514353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089fd081-5f16-4fe1-8539-7815d1549032/tetirubirivudojo.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/64742062042.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/3d_interior_design_software_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/80870071522.pdfIn PDF document text
    • http://penanaras.myartsonline.com/gunakakaxonijozozefel.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_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 5180 bytes
SHA-256: 218b0954223f1123d0015b97c91f4991e9c2c99da3300c70ddf6387055c8446a
font_01_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 10864 bytes
SHA-256: 1d55337aa73c35384f64252d5cc6fd137e8a57437f82ac598731f8e1568e6265

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