Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d742d5f68e36c2e…

MALICIOUS

PDF

86.3 KB Created: 2021-03-19 06:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17b218304622a64b8fbcf3c2290fef81 SHA-1: ed6d5afb76ca57e81afe8c43197df4bb7f460780 SHA-256: 4d742d5f68e36c2eb993b52c682938f5b6e1e3db42317064f0e30e90ab0e655d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, identified as a link farm, with a deceptive lure related to geometry answers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=geometry+lesson+10.2+practice+b+answers
    • https://cdn.sqhk.co/bixatavafut/4iihbeO/juxujekisotazun.pdf
    • https://xoxawipexari.weebly.com/uploads/1/3/0/7/130775732/zajebeworov.pdf
    • http://pumesuj.iblogger.org/51868643829.pdf
    • https://marutonekuposew.weebly.com/uploads/1/3/1/6/131606360/fuwowukog_tigef_piwozaluwobe.pdf
    • http://jaralet.getenjoyment.net/68445892614.pdf
    • https://gulesome.weebly.com/uploads/1/3/4/4/134496781/mufamarupewuzos_xujix_limunupa_kawivapezogud.pdf
    • http://tozemudezajif.mygamesonline.org/rifipaxudedajuwifosiwusu.pdf
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/3341eed.pdf
    • http://rifivejawix.22web.org/25740880935.pdf
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/rikitodujo_fisizasuloxo.pdf
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/terajogiwogudufi.pdf
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/purizosofugumuvimus.pdf
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/8668bd51e6f2c75.pdf
    • https://cdn.sqhk.co/mitejapeki/ggohcgj/turbo_dismount_2_uptodown.pdf
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/db26c369ee2.pdf
    • http://gegetibobiduvud.iblogger.org/piensa_antes_de_que_sea_demasiado_tarde.pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_604123ce6d2e9.pdf
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/zixilawozegi.pdf
    • https://cdn-cms.f-static.net/uploads/4473047/normal_5fd7b92f14276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kozinid.epizy.com/argan_storia_dell_arte_moderna.pdf
    • http://pefimubis.myartsonline.com/physics_of_solid_state.pdf
    • http://liroporuki.myartsonline.com/75465508425.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_off00011396.bin
6984f23b993760ca3ab32b41d29d074b6854fe4e4958fb60945fb455934727cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 5804 bytes
font_01_sfnt_off00012760.bin
e2556a913f455aea574184e80e21d87ee6d71003b4d18872c8cc7a6faf15fa5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 10616 bytes

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