Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5b709184282ec9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-13 14:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f34bbe2b9d9480b9cebb51ba17c78b8 SHA-1: 215559cc90800c9d4029cc05b58e46c7c6dbca4a SHA-256: ec5b709184282ec937bfa3b4aa4b66a28669b594654e7208ca38718628b77178
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it is intended to redirect users to potentially malicious external sites, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the PDF's nature points towards exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imagebuzz.net/ckfinder/userfiles/files/45295480350.pdf In PDF document text
    • https://groupunsur4.com/contents/files/bulama.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/letefovatonirogu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/vopisexilujodumojaxan.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zimuvonabofupunoba.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/88530424426.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/33257629119.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/92177507583.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/5795322833.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tivixidifotitaroxugumona.pdfIn PDF document text
    • https://plasy.com/uploads/file/33864096392.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/jenozurog.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/vikonerodixufibored.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/55026714229.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/3170969672.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/talodumalekuforik.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vefefed.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/36497242389.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/33258858987.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wuxobijuloxi.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/86352958210.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/91617774314.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900662c7e3---tigilemarenumupiwa.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/ronizegaxaderuxipozejaw.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xudofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=slam+dunk+gbaPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 10288 bytes
SHA-256: cf7412c06fd9f41e3e0e86dc686bfd7856e1e884a61d8ddf16bfea5ecc1dfe88
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 18248 bytes
SHA-256: 4012de9552be71b3094d282a1af66c0afdef49ac7651ece2ea1a4b80d8beedf9