Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c2007a2d25187d…

MALICIOUS

PDF

70.1 KB Created: 2021-03-20 21:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16e17d38588d2545553b330ba5459c9e SHA-1: b55645aaf1eccd31034ef961edcb23b028127f11 SHA-256: f4c2007a2d25187df8847e1688bd129fe0e379f14a7ae04ebde2e1a839b7f95e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/wix?keyword=newfound+school+district PDF link annotation
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/9852399.pdfIn PDF document text
    • http://mitefakosutupot.22web.org/taurus_pt111_holster_size.pdfIn PDF document text
    • http://bosajefidil.iblogger.org/zotatufepitinivuwis.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/scarlett_2i4_problems_windows_10.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/online_website_to_maker.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/23a0c.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/bodapofikenilorizoko.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/vulivovunozowuromibe.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/pulofi-pamufolido.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/fapanis.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/47517960638.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/pathway_fistula_perianal.pdfIn PDF document text
    • http://zunidesejive.22web.org/74392115955.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/568927.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/zivuguvobefodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulifal.onlinewebshop.net/pdf_rewriter_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d22fcf-8907-429b-b0f3-173acb5700f5/fifoxogo.pdfIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/xepizotubibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf70ac1f-cb00-402d-adce-c854b9257fa6/62172458858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f727b3-d8b4-4727-9eaf-3e7b582100e5/yamaha_rx-v573_receiver_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc264d6-fe48-4f87-9e96-da5dad2e1c33/how_to_combat_reverse_psychology.pdfIn PDF document text
    • http://bufetej.epizy.com/82314661572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd6c5b1-0441-4e33-8051-9b507e8cbbe6/kalifenusozoniribesa.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/laser_beam_welding_process.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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 4960 bytes
SHA-256: 2c8d6a71ba0d56d35f801b131f4c876cf066268e4997fa887bfecb66d27aa549
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10420 bytes
SHA-256: 13801f703a61a174539ac3e601b7b3a9fa0f36e572c7186fd72275c34ed9d479

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