Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f189b976a803469…

MALICIOUS

PDF

82.0 KB Created: 2021-04-19 06:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0195c7774434d89e4b94d26117099047 SHA-1: 62fc1c40a8a72cf196aaf92e2010d1e4a78f66ee SHA-256: 2f189b976a80346957d794b560d5d3e63afa1c5a29bef642606f6e4a5c8dd494
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=humanistic+learning+theory+slideshare PDF link annotation
    • http://autokenn.com/60854492227chiqm.pdfIn PDF document text
    • http://mif-smeh.space/fodegezokofixisuketawuzaqi5fn.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/57620778060.pdfIn PDF document text
    • https://cdn.sqhk.co/nubevitawil/Dgibhi6/17122114360.pdfIn PDF document text
    • https://cdn.sqhk.co/xopimuje/ijfxjjd/zufinumanikuridaxikise.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/djavHBT/delalemolorezuva.pdfIn PDF document text
    • http://natlab.ru/purokebfso7t.pdfIn PDF document text
    • http://verifiedbadges-form.com/97558150527mg0fy.pdfIn PDF document text
    • http://wukivobezoba.iblogger.org/wowajudokitewusogew.pdfIn PDF document text
    • http://50off.pro/biological_wastewater_treatment_series_volume_4ounuz.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/texuzoxubizunopinonokazumf1.pdfIn PDF document text
    • http://geosen.net/suriwafofarevul7f3v1.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/ajd4M9W/ftdna_test_kit.pdfIn PDF document text
    • http://wopedejani.iblogger.org/vuvibosatamugaxepo.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/vojagitemalatumovofirajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixapesuj.rf.gd/the_spectacular_now_trailer_song.pdfIn PDF document text
    • http://ratagewenik.epizy.com/bgv_form_abbreviation.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/68717360028.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/verb_past_tense_definition.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/can_you_buy_penny_stocks_on_robinhood.pdfIn PDF document text
    • http://nununad.myartsonline.com/burger_king_large_fries_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/61806297171.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_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 5416 bytes
SHA-256: 4da24dbd93aceb6d5386dbec4fc4644744dbc27903d803c1e26439a72c995b86
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 10616 bytes
SHA-256: 23aa8e443356ad7db778f7cc69c892b678a86a662eac6e77ab111eebd8898fb8

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