Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cb70b7e480f461…

MALICIOUS

PDF

73.1 KB Created: 2021-03-16 22:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0737ac121bca08fceaab995226031a8 SHA-1: b63e595350731ce4cdc7183426dd60226908565e SHA-256: 85cb70b7e480f461d778591889cb6b74cbb131a1baa1ef002600deedfc64900d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the '7th grade english test with answers' content and numerous embedded links to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards the potential for exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=7th+grade+english+test+with+answers PDF link annotation
    • https://cdn.sqhk.co/lojegalivo/shbYjf6/tulobefadirotoporekotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feb486eaddff.pdfIn PDF document text
    • http://xiravudes.22web.org/nezibagakefilamekeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_600f27c1bcc0e.pdfIn PDF document text
    • https://cdn.sqhk.co/zuboxizip/Vkhhsji/shalaxi_helbane_datasheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405184/normal_5fe27ea09aa01.pdfIn PDF document text
    • http://doweryklkq.space/night_owl_optics_nexgen_night_vision_binocularsi95du.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6017ba99358a0.pdfIn PDF document text
    • https://cdn.sqhk.co/nefijisob/gfIhhiJ/free_online_hidden_object_games_gardenscapes_mansion_makeover.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/gcorgjJ/84020882436.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/ijhbjbi/fire_and_glory_outpouring_2019.pdfIn PDF document text
    • http://bufaturofonoko.22web.org/steam_api64._dll_win7.pdfIn PDF document text
    • http://lofitner.buzz/omnitech_shredder_manual0qpyx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/sjcam_sj4000_air_4k_firmware.pdfIn PDF document text
    • http://wamesugome.rf.gd/freeze_row_in_excel_spreadsheet.pdfIn PDF document text
    • http://tifijawubizomed.epizy.com/60298071707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a087c4-d824-46d9-ad40-3d06421b7532/what_does_the_term_broad_statement_mean_x-y1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6254370a-9317-4acb-b497-91e6949ea5a1/what_is_the_average_yield_of_the_s_p_500.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/differentiated_learning_plan_template.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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 5164 bytes
SHA-256: 0afaf4c9a88b827cf848b48015d09764f9101e195ffdaf4e4e790ba16841c6c2
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10916 bytes
SHA-256: ff20b27e6e177c58853d76c71e23b86389964e9f15ff980f5fd525b121af81ef

Open this report in the interactive analyzer, or submit your own file for analysis.