Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36f117e90b7b3a1…

MALICIOUS

PDF

73.9 KB Created: 2021-03-20 14:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b925b1e146fce7f6fb00afb0144cdbb6 SHA-1: 76a316c4b4d3514ea605f8228584e5e39c9716ef SHA-256: f36f117e90b7b3a1f25197cc2228fbb2c147fe85139ac107cbc9c682b1e5efad
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many redirectors and disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/wix?keyword=atlas+shrugged+free+pdf+copy PDF link annotation
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/jubevizerorobib.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wixubabatoxijor.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/bN9hfhh/dollar_tree_careers_official_site.pdfIn PDF document text
    • http://blu-ital.space/mugipobirafapufijazq74qz.pdfIn PDF document text
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/2603623.pdfIn PDF document text
    • http://exampl1214.com/static_and_dynamic_surface_tension_measurements2flk9.pdfIn PDF document text
    • http://mexicotop.xyz/como_fazer_para_nao_descascar_a_peleapd9z.pdfIn PDF document text
    • http://newberginvestmentproperty.com/fabexupabujoravugowuxia9mkq.pdfIn PDF document text
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/85148.pdfIn PDF document text
    • http://vuvuga.xyz/539656889446bsvb.pdfIn PDF document text
    • https://nozasereb.weebly.com/uploads/1/3/4/4/134499995/rarokof.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/64562271207.pdfIn PDF document text
    • http://sumaralomemev.iblogger.org/59846219883.pdfIn PDF document text
    • http://changepass.online/zaginezugopujex2sxt.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/ieXieih/49027804021.pdfIn PDF document text
    • http://istra-backwater.ru/does_zero_waste_make_a_differenceyshe9.pdfIn PDF document text
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/48d883288be99a4.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/hfhudji/project_manager_construction_salary_nz.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/what_army_regulation_covers_policy_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/iaY6yhc/268918516.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/eibgghj/sputnik_movie_review_guardian.pdfIn PDF document text
    • http://reduslim-italy.site/moxisojomizupepazodou793k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruludamena.epizy.com/android_button_onclicklistener_switch_case.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/19007294110.pdfIn PDF document text
    • http://xupapuxonoxun.rf.gd/36662036296.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_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 5508 bytes
SHA-256: 565c6b6167495573f69799bf5870f3b2dace2d5ca75a17ed46fbc461cb1b08f4
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10276 bytes
SHA-256: e6d340cf94d0c452c368cedd5a0453b0c62d7c249b46fadd37f2a57143afbaca

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