Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb65496f218933e3…

MALICIOUS

PDF

78.9 KB Created: 2021-04-08 17:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e0bae7b967eaeed46b08aa16f5cdb6b SHA-1: dd3725cd38a101c5273471ac133c6099eb6daa17 SHA-256: eb65496f218933e3ef17962ec45ea40f38b5dd423f3cbc1b85a1c8e0f3cd1c80
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it's a malicious redirector link, pointing to 'https://yafferge.ru/strik'. The ML classifier also flagged it with high confidence. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious infrastructure, likely for phishing or malware delivery, disguised as a download lure.

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/strik?utm_term=how+to+enter+wps+pin+on+at%2526t+router In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_605a2f9f2fb4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5ff2ccc467ca1.pdfIn PDF document text
    • https://cdn.sqhk.co/mesedupene/XghzLFE/software_printer_brother_dcp-_t510w.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/EuijgjP/while_driving_in_school_zone_speed_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/duxevowoli/ibhfihj/skies_of_arcadia_legends_moonfish_guide.pdfIn PDF document text
    • http://rizovog.iblogger.org/install_play_store_on_android_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/d0Ehd9x/he_doesn_t_love_me_anymore.pdfIn PDF document text
    • http://winfreeiphone.xyz/69624609218jhle.pdfIn PDF document text
    • http://apsdd54gfv.xyz/boost_jump_park_covington_gambwjo.pdfIn PDF document text
    • http://italia-doc.space/kustom_pa50_subwoofer8af6x.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Ehb3tgj/startup_the_board_game_geek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/362877c5-bf26-447f-9dc0-3ce3acc5a08f/libro_el_dador_de_sueos_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24929eb9-c584-4883-893d-b4cc4d2a879c/42232404597.pdfIn PDF document text
    • http://lugimes.epizy.com/2004_yamaha_banshee_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43640cb-8f81-417f-98c7-463e50917208/the_night_before_christmas_childrens_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c47457e-e1b1-4818-a4aa-dfbd02767f37/pathfinder_2e_advanced_players_guide_trove.pdfIn PDF document text
    • http://fefipunoz.rf.gd/88749380368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f716362-2f44-46b5-bf30-89e720ee880a/wonifudil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 3048 bytes
SHA-256: e75c466d3765961f21e611c18b38909e6397db9038ae1d2f40e0c48109207e17
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 4832 bytes
SHA-256: e5b07b026228e0e98fea08ae1df42d3c41336d64104fda60ab0af8e4b24573a2
font_02_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 10680 bytes
SHA-256: 77bfaed989e0a38d0f576f2d26c47b0c77d0b785c574e405f2e80099e9e8f7d4