Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfa98679566b8e9…

MALICIOUS

PDF

81.6 KB Created: 2021-02-27 02:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5b23e48f4181bee7581deb90200be2c9 SHA-1: b8985fb3eda1f1c785d7f2c3973945fa5b1633e7 SHA-256: ecfa98679566b8e98126e7ca3128206d7abc63a77cd8af7c8a66046ef8b36d8a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one that appears to be a lure for technical information, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the link farm heuristic suggest the document is designed to distribute further malicious content or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=how+to+bypass+maytag+centennial+washer+lid+switch PDF link annotation
    • http://fefiwizam.sportsontheweb.net/rowefukikevonotimosasoteb.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/ghxbpqg/konej.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/stamina_body_trac_glider_rowing_machine_1052_vs_1050.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/soveridovidexumogirat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_60281a47a858b.pdfIn PDF document text
    • http://dutakevekuw.iblogger.org/61323821415.pdfIn PDF document text
    • http://dokojusekorukuf.iblogger.org/33886818135.pdfIn PDF document text
    • https://cdn.sqhk.co/mafomawoxali/cjj3ha5/63054149559.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/c7EMiaO/faleduza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_600f792c0a1ca.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/95079251415.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/IhdyIEN/jifebafetogudisufutuget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupizamowakop.myartsonline.com/can_i_renew_my_license_at_the_kiosk.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/43447654168.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/69711330614.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_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 5780 bytes
SHA-256: 9bbf1f34e6f7cbd3ffe7c425af230576350b1d261e095e256cb02368805d3800
font_01_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 10648 bytes
SHA-256: f83701b2c9487ee8d5fe0f8f9bcd53be11615a296dfadc5deba22b616711b8aa

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