Malicious PDF — malware analysis report

Static analysis result for SHA-256 403ed0cd4cfcee33…

MALICIOUS

PDF

75.1 KB Created: 2021-04-22 16:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34064f35bb7ac8e0b12b2418806f3b0 SHA-1: 1addf00ce2ca33c8c7db65d8e32765869a2d831a SHA-256: 403ed0cd4cfcee336418181d46c7152af9065ec5ffc0c6001b080754dafabb07
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML score indicating malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a thermostat, directing users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=aprilaire+wifi+thermostat+8820
    • http://newsportstechnology.ru/senufavirefujoverarish1.pdf
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/pujepujo_dakop.pdf
    • http://igcopyrightverify.com/chandni_chowk_to_china_song_pagal87rdq.pdf
    • http://autocredit.moscow/how_to_check_transmission_fluid_2008_jettay5vy2.pdf
    • http://nituzovido.getenjoyment.net/nilelavepanonebebi.pdf
    • http://nabavawuzafurur.mygamesonline.org/estrategias_de_la_cadena_de_suministros.pdf
    • https://cdn.sqhk.co/vapezuwe/djiYdie/2052154188.pdf
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/lizabuvizewu_dapuf.pdf
    • https://cdn.sqhk.co/dasadogiso/FAgfKR8/kobumanejegusuladat.pdf
    • http://gusebozaromurel.mypressonline.com/35319989286.pdf
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/jivuwagogawab_pebuvar.pdf
    • https://cdn.sqhk.co/pixorikibam/8X6icja/7439662142.pdf
    • https://fejalunaruxepiv.weebly.com/uploads/1/3/4/4/134489653/nuderudi_joxinunezej_duxaroxiw.pdf
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/7269691.pdf
    • https://cdn.sqhk.co/nepozenilu/XnJnAif/xajunumafikedit.pdf
    • http://raisinshq.club/how_do_u_multiply_radicals0qxip.pdf
    • http://dimozakebaba.scienceontheweb.net/fisegewixulokikivaj.pdf
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/padixaxabiseja_xinoli.pdf
    • http://rodina38.ru/information_about_weather_and_climate_of_pakistanqzq6l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lopadivupudexa/05_cadillac_cts_engine_swap.pdf
    • https://s3.amazonaws.com/fogibi/vanro_anarchy_online.pdf
    • https://s3.amazonaws.com/bogeguva/jivagib.pdf
    • https://s3.amazonaws.com/potamotaz/62099872868.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e5.bin
58c5860024651a5d28624fab1c732ecf95cc249a7614d88b5538d404aedeb0b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5692 bytes
font_01_sfnt_off0000f82e.bin
a09a0f07c4c8311cfc03ac388a270161643bd57d0779496712318221e0e9b22b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 10932 bytes