Malicious PDF — malware analysis report

Static analysis result for SHA-256 3539a0efa00c532a…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 09:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf0dccc9685afe30f4503ff560ef1dea SHA-1: 61417e85a645544bc2ba1ff07afd466066cb25a8 SHA-256: 3539a0efa00c532a7277dcb78ee5cff716570a51c974b9d2e5a40dae82913438
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=the+legend+of+zelda+the+missing+link+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5ff5a3ffef977.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/hinggbw/1019_east_front_street_berwick_pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5ff54a7a5eae9.pdfIn PDF document text
    • http://p-kavkaza.ru/walmart_green_supply_chain_case_studyh50st.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/ropinutipinuguxisilivaro.pdfIn PDF document text
    • http://legendbilisim.com/dineina_y_kinesina6njux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_603825441c0c2.pdfIn PDF document text
    • http://erogan-encolumbia.site/62304368847c6pmh.pdfIn PDF document text
    • http://trysoda.pro/glock_19_gen_4_undercut_trigger_guardtmwsq.pdfIn PDF document text
    • http://bigwin-1xbet.fun/hydrochloric_acid_safety_data_sheet_uk517ux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_6038fbc5cc0e7.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/when_did_bc_and_ad_become_bce_and_ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_5fd9bac80ae5d.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/G5hjYih/phoenix_weather_january_24_2020.pdfIn PDF document text
    • http://wekeb.space/battery_operated_lights_for_pumpkinsawlrf.pdfIn PDF document text
    • http://luchdobro.site/technical_writing_courserav187d.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/ShfYdjb/rainbow_snake_for_sale_uk.pdfIn PDF document text
    • http://uscreditinquiry.info/lexixcrbif.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/90082962854.pdfIn PDF document text
    • http://damvglaz2.xyz/24235697591uog3c.pdfIn PDF document text
    • http://emirofficialzm.com/friendship_kavithaigal_photos2stj7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirulibas.onlinewebshop.net/siloxadobavavanemo.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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5288 bytes
SHA-256: 08652ff9c44ef7aaf612bc09c51a87e1245f63e45f9ea14b36fe3505aa40854f
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 10276 bytes
SHA-256: be54116d692810d92ca6913d84d35521bc27b9d03a2758a52740940892c4fe6e

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