Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a77cdcf0d655c28…

MALICIOUS

PDF

82.5 KB Created: 2021-02-21 10:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5c355f69520499e21e4c59093003c9b9 SHA-1: 61cdb8fc9598f9a108b66ec4718ccb0f905f5808 SHA-256: 8a77cdcf0d655c2829fe83eee8ac2deb9fc2a5d07371e898aeb38898b3f12b9b
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=gears+of+war+4+crack+1909 In PDF document text
    • http://poboxabirukus.iblogger.org/cheat_gangstar_vegas_android_1.pdfIn PDF document text
    • http://vakisegu.iblogger.org/26309205267.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/magic_chef_mini_fridge_freezer_stopped_working.pdfIn PDF document text
    • http://godubumoze.iblogger.org/milududoxekalazovenon.pdfIn PDF document text
    • http://mosasekoz.22web.org/como_hacer_manualidades_del_dia_de_muertos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5fc9d897ae75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fd9002b3334f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5feb443daac29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesilav.rf.gd/how_much_does_a_mercedes_smart_car_cost.pdfIn PDF document text
    • http://desavoz.epizy.com/how_to_setup_canon_printer_to_print_wirelessly.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/cbx_200_strada_manual.pdfIn PDF document text
    • http://zudozam.epizy.com/bobupinomivaxavatopewine.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/27043760585.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/massey_ferguson_231_parts_list.pdfIn PDF document text
    • http://bogukap.rf.gd/fugodewosel.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_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 5468 bytes
SHA-256: 613f46dee17e1a3ec8b4c6204aca3b355f969bc9f6aa5b93db6c0977a063a26e
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 11532 bytes
SHA-256: 48d230857b5e2c8728cbc7e1e3a895c4e5caef14ee79c1f2b66253f9dabb1d28