Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3ec63838c77832…

MALICIOUS

PDF

72.4 KB Created: 2021-02-23 03:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0743a2a85bcf68cfe13e7e9e3e905d70 SHA-1: 0449e00ea3b3af7e38f8029957ee986b1b7c15ca SHA-256: 6d3ec63838c77832e6abe353eb84240b2bc473c2bcb15b309d6544f3b1d7363c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm hosted on disposable infrastructure. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/strik?utm_term=technical+drawing+tools+pdf In PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/gomaxutef.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/fidhjiQ/colt_express_playmat_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/rRhghdX/vivukotu.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/KHgiFhc/try_it_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/ie6ihgc/sutazajepu.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/ggDBih3/stick_war_legacy_music_videos.pdfIn PDF document text
    • http://kobasobapina.22web.org/credit_report_sites.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5ffea735ea2d9.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/fZDhfia/39127659579.pdfIn PDF document text
    • https://tokokurud.weebly.com/uploads/1/3/4/7/134744431/pikodofisurona.pdfIn PDF document text
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/rawasenegebe.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/ibjajjY/saguzogegujuxesixezojedun.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/fme3Gha/slayin_soul_knight.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/gejhGhh/world_war_1_propaganda_posters_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/dorMiaP/bounzy_all_spells.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/W7iHoWv/sas_zombie_assault_3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwumipulufi.epizy.com/alopecia_cicatricial_en_nios.pdfIn PDF document text
    • http://lowefukoxoxegab.epizy.com/easy_piano_christmas_songs_free_sheet_music.pdfIn PDF document text
    • http://mukexojot.rf.gd/is_garmin_better_than_lowrance.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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 5456 bytes
SHA-256: f426103fad66de497171b78549d6c50c182a0bb372e85d469fb0a1f224637d39
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 10516 bytes
SHA-256: d19de3fda65b37f5ee90fb4c23285a8c011e594d69a947417302600730d070a2

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