Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9879440b7b771a9…

MALICIOUS

PDF

83.7 KB Created: 2021-02-27 07:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b891cc029650ced359b150bcd72e8377 SHA-1: 5268b7ef18cd71458db514b18186ff94e82a6feb SHA-256: a9879440b7b771a98658c1032b9236533b48e4451f8f4ebde200638da230654d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://zajinet.ru/wix?keyword=parts+of+the+violin+worksheet+pdf', suggest an attempt to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=parts+of+the+violin+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5feafbe5d4352.pdfIn PDF document text
    • http://circleshtang.xyz/school_supplies_in_spanish_worksheetzc83m.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/kibaxigozexozojirisiso.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/36984546290.pdfIn PDF document text
    • http://1cats.space/petit_nicolas_chapter_2_summaryitb1i.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ggciajh/95770335455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_600522489ade8.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/wireless_headphones_for_my_lg_smart_tv.pdfIn PDF document text
    • http://vulifux.66ghz.com/94108234043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fca29c60501d.pdfIn PDF document text
    • https://cdn.sqhk.co/gizafimode/jgcibj2/sniper_elite_4_co_op_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/y9Iiiie/ralphs_king_of_prussia_menu_prices.pdfIn PDF document text
    • http://freshka.fun/fukeburenilekumukarurv4.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/kelukakeb/content_creation_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/dibudeperawofeposavixuja.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/82129485085.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/gisumimokofuvonese.pdfIn PDF document text
    • http://wofeginu.rf.gd/trip_to_bhangarh_movie_300mb.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/vector_addition_and_subtraction_worksheet_with_answers.pdfIn PDF document text
    • http://veputowiki.epizy.com/augusta_university_financial_aid_adjustment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/tawny_port_nutrition_information.pdfIn PDF document text
    • http://zuzekawi.rf.gd/shakedown_hawaii_vita.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/hiring_request_form_template.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_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 5344 bytes
SHA-256: 2075733376602fdd6f845eca971ea8b9da872bd37711038524d9f4c848c00690
font_01_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10592 bytes
SHA-256: 07e7d4b76d5637e3ae9b039e2658ca883fb3e830f63571af990a920a3f969275

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