Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb933e0cba02dc1…

MALICIOUS

PDF

89.3 KB Created: 2021-03-26 10:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 97ead2ea722fd0560cda051aaa44f620 SHA-1: e6e7c91fe441876856154d621c86478daef0c727 SHA-256: 0cb933e0cba02dc1bec9712c0ce4921b3ef84deeadd82315b69d41f1dcf0e95d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://botokaw.ru/award?keyword=tipos+de+calderas+pirotubulares+y+acuotubulares+pdf PDF link annotation
    • http://steblin.pro/95841823312r3xks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_601dbb8498ccb.pdfIn PDF document text
    • http://semengergel.ru/ge_logiq_e10_manualt3zbi.pdfIn PDF document text
    • http://sysfix.ru/33948754668d2wof.pdfIn PDF document text
    • http://instahelpforbusiness.com/password_protect_adobe_dciv54w.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_60590eab3a3e2.pdfIn PDF document text
    • http://golosa-spasibo.ru/pizolezujzytu5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_600a1d51abeb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_603947d87f198.pdfIn PDF document text
    • http://creditpm.com/cuanto_tiempo_tarda_en_cicatrizar_una_cirugia_de_vesicula1d3je.pdfIn PDF document text
    • http://clebohets.xyz/escape_alcatraz_game_all_answerso2vle.pdfIn PDF document text
    • http://hayatevesigar.online/2d_and_3d_shapes_worksheets_for_grade_2uygnf.pdfIn PDF document text
    • http://lesantyqas.online/37473430746uci8i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fdffe43d498f.pdfIn PDF document text
    • http://ca-manalapan.space/38480729138weytr.pdfIn PDF document text
    • http://reduslimitalia-official.website/officer_buckle_and_gloria_booklhigk.pdfIn PDF document text
    • http://keepsufi.space/who_were_the_members_of_the_first_estate91deb.pdfIn PDF document text
    • http://grantmedica.ru/mcgraw_hill_geometry_answers_page_183lu802.pdfIn PDF document text
    • http://xadixul.66ghz.com/where_is_acer_laptop_battery.pdfIn PDF document text
    • http://update-win20.online/fumawibuzadaciitg.pdfIn PDF document text
    • http://coolmag.biz/large_word_search_puzzles_for_seniorsrs8fd.pdfIn PDF document text
    • http://puligej.iblogger.org/how_to_answer_the_phone_in_english.pdfIn PDF document text
    • http://albl.ru/782438174715nar1.pdfIn PDF document text
    • http://airbin.top/how_to_download_samples_cymaticshibkd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudajulasur.epizy.com/hard_disk_utility_software_free.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_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 6604 bytes
SHA-256: e9f1eef1b09acbe681eb27c8211c73bcd0ceb7face293a5b6bbafebb44861232
font_01_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 5340 bytes
SHA-256: 5a91e11ef92dc064371f90b54cf19d8ce0ff43d5d0b332a1454cb8a6a9e59324
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 12336 bytes
SHA-256: 9513e6678619491ce833bc41f2c4d3cd7a89ce7513f63f0171ebcdedd03a56d9

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