Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fcf5384d17cf5f…

MALICIOUS

PDF

89.3 KB Created: 2021-05-01 19:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b728f38115d84f102557e890fc4175c6 SHA-1: 8e86bfc86bde3065b791b55958901815f393d4d8 SHA-256: 56fcf5384d17cf5f19f9875665145fd01b8ef21e310812b8d89464207cd6fced
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://pelibifir.ru/strik?utm_term=amazon+echo+commands+for+fire+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417423/normal_605ee29deab17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_605cf28a5b152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_603abca4b09dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6040745d35be8.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/YifjdmT/skullduggery_toys_out_of_business.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/jjithaV/friends_tv_show_quiz_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuzoda/6CThjrS/mopepazarurobi.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/oSeih8r/sijudasojexujapet.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/jeOhihf/73361933442.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/i6jahhw/bumavevigoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_60037c4108382.pdfIn PDF document text
    • https://cdn.sqhk.co/banozesimane/RT9H7yS/91421336156.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/cVAde4X/wejopavirazugajiwop.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/da09e70d-8c53-4951-a018-16d1b99ccbbe/casio_5208_battery.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_b42a3bdc55b34788963c6c0abe0eeb7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25585487-8e1a-4ca7-a5e4-88ce84359c14/63366608724.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_94a10998b99b450ca5f06cdb0233c53e.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b8a0236907ad46caab11078551c8e34c.pdf?index=trueIn PDF document text
    • http://dovudegumigisaw.rf.gd/delta_monitor_1700_series_cartridge_part_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc6ddb0-22a0-45f7-a559-ef7f8b8e8821/cub_cadet_lt1045_mower_deck_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27db994e-dd65-4ffe-80ca-cca132cc7a3b/best_songs_80s_90s_remix.pdfIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_87560ac9fea848dc902a3ed140c83076.pdf?index=trueIn PDF document text
    • http://terakezakoju.epizy.com/computer_memory_and_its_types.pdfIn PDF document text
    • http://bipolewajavovad.epizy.com/bosutimikawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/226ba0b3-a76e-44db-bb23-65d91100c1aa/post_acute_withdrawal_syndrome.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_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 5328 bytes
SHA-256: f19831724d1ec8f4b429dfca44fa9d116bc32a4428e2bd559d42cbc7ebf04fac
font_01_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 11192 bytes
SHA-256: 8aff2a19556418639dc3bc359011e2180ca829f5716807c77f90e7bd320e9ce8