Malicious PDF — malware analysis report

Static analysis result for SHA-256 972d03831eb3ba38…

MALICIOUS

PDF

69.8 KB Created: 2021-03-23 00:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 07cf9ed526765077229a5848e6c06b96 SHA-1: c92f0b9c938637583a783c05e41d486e52716d60 SHA-256: 972d03831eb3ba38d0bb415913fb5726d12b86e04b6572d6b6852f113406e1a0
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many hosted on disposable domains, designed to lead users to credential phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically for phishing. The document body is heavily obfuscated and unreadable, but the presence of numerous SEO-style links and a specific brand impersonation lure points to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/japonuxazitejaw_soris.pdf.
  • 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://jacksth.ru/wix?keyword=aqua+affinity+1+helmet PDF link annotation
    • https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/japonuxazitejaw_soris.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/automatic_pneumatic_clutch_and_braking_system.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/rofiwodu.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/CR5XIhe/hearts_card_game_247_expert.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/xiaNnWt/bixusepemimubewi.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/xadalitaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/4Rgihf7/ultimate_spider_simulator_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/t5EheNh/zepuguzu.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/28436485991.pdfIn PDF document text
    • http://vemelaribox.getenjoyment.net/75018603608.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/iaiggiu/15500390768.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/hgwigie/xamepamadinowilaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panobamufa.epizy.com/examples_of_system_software_and_application_software.pdfIn PDF document text
    • http://mavuriwowul.myartsonline.com/best_annotator_ipad_pencil.pdfIn PDF document text
    • http://junedujivoxoz.epizy.com/heart_failure_guidelines_2018_esc.pdfIn PDF document text
    • http://nonozud.rf.gd/ajouter_dictionnaire_clavier_android.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/math_minutes_8th_grade_worksheets.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 5004 bytes
SHA-256: 09b23b18ebc7144a303bf16987330862f3de018565e1021e0c954e7fb3ed51df
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 9740 bytes
SHA-256: 94c5bf64d2a9148ba8af3a7fe8151864939f432af3cb5cb00b87cbe80ca84375

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