Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e1ac9818a2022b…

MALICIOUS

PDF

75.5 KB Created: 2021-05-05 14:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8322a1a08d2eb18bf8d30851bf60c3b1 SHA-1: 53cd1cda296b9d251de93afca20332c2db175025 SHA-256: d9e1ac9818a2022bc5d4bc2e495f0bd89d350d72aed08cf29d659792b30102e3
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to educational queries, designed to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=which+iit+is+best+for+msc+physics PDF link annotation
    • http://xunopapazugatar.medianewsonline.com/fipubomubetizukawapeguk.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/fajudosorelo_podibuwugujixi_nebov_lomeximoginun.pdfIn PDF document text
    • http://waralolojogeta.sportsontheweb.net/54079006922.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/xaxuvusez.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/charing_cross_hospital_map.pdfIn PDF document text
    • https://risibazizugati.weebly.com/uploads/1/3/4/7/134710005/c927dec70c87886.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/ugc_net_books_for_computer_science.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/contingency_approach_to_management_theory.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/zonil.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/movorumunuluxafepumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287976aa-8d67-4a64-b693-554db2ecea23/how_to_adjust_hook_timing_on_brother_sewing_machine.pdfIn PDF document text
    • http://kageditivumimor.onlinewebshop.net/tupipawovosowomesalotuko.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/mikipunivoduvikotepof.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/35223275823.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/ny_times_crossword_answers_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/82978901772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce17391-5ef1-4375-b574-3d1cc65f3a75/how_do_i_find_out_what_year_my_samsung_smart_tv_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a33ada-9252-463e-ad53-e7742490ad70/pitexolun.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/zuvixogar.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 5268 bytes
SHA-256: 4d3c2b413433cd3999c231e20bfb0c36652912eb5ed7422884ae6b4e2c4be4f4
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10812 bytes
SHA-256: 1d1ec15405a11ac301d0c0e7b1914c407e78aa511ec0ce38a64f55f64b193139

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