Malicious PDF — malware analysis report

Static analysis result for SHA-256 6506440d870e5d85…

MALICIOUS

PDF

82.5 KB Created: 2021-05-02 00:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 52447458e52be82e1e9b92b2db29a0d4 SHA-1: d988102c74e0c1c7f5a0ba087aaa8dce621e83eb SHA-256: 6506440d870e5d8566ccef08fa71e3830b535ce85043b6152f2766eba1f8a7e0
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, as malicious. The PDF contains numerous embedded URIs that point to a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=wd+tv+hd+media+player+alternatives PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6068e9d57ce83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5fc96a8ed914a.pdfIn PDF document text
    • http://shop-onlain.fun/wenzel_monarch_tent_instructionsmr4g3.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/hcgdEEM/journal_el_khabar_d_aujourd_hui.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_5fd27158a2b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_603b97c7ca04f.pdfIn PDF document text
    • http://rifimakegezibor.22web.org/domizuzanefene.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/zhhLrja/liverpool_latest_transfer_news_update_today.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/whcgchi/spider_solitaire_card_game_free_online_aarp.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/hilijAQ/susuxetubolamodifewom.pdfIn PDF document text
    • http://reduslim-buy.site/39035223657xwgzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe3fbe2ed800.pdfIn PDF document text
    • http://slmit.fun/iot_farming_applications8l74i.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/bWmlhaH/banufavatolebosifixadeb.pdfIn PDF document text
    • http://fimewot.xyz/277261129601fdce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_602eddf9a5241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixawur.rf.gd/16234907757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723b495b-6222-41c3-b819-4250af259bf9/wurebizemimi.pdfIn PDF document text
    • http://pugetuwozijeso.rf.gd/introduction_to_sociology_anthony_giddens_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee17ca90-9ce0-4f7d-a379-7a9a8248328f/76478933291.pdfIn PDF document text
    • http://ludodugadigepez.rf.gd/zepifisaxefini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8af7b7-5aa9-471b-8fe9-c5ee776b29fb/138_longwood_lake_road_oak_ridge_nj.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_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 5376 bytes
SHA-256: 8219615e62ae1a18fa89b117cad141440329cc008a5b75e9a4eaeda86c2b082e
font_01_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 10956 bytes
SHA-256: 045ef697de19b0c10f04f9579c8db493ad774961ec8f11224ca624eff7b2d3d2

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