Malicious PDF — malware analysis report

Static analysis result for SHA-256 403225ecd5f5a4ce…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 15:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ac7ec5bc76d3eb3f6306d41827bac13 SHA-1: 93f4da90c891aef5f8e256c2712e3c3c79a29664 SHA-256: 403225ecd5f5a4ceda6f65e6c406a1f7ebe7b476ead78ab80a8d6f999c312765
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=galaxy+a51+one+ui+3.0 PDF link annotation
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/14516249044.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xefar.pdfIn PDF document text
    • http://mc-opony.pl/files/file/60591580873.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/jitoj.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/livewatifomifexumiwev.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/66448594906.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/74770957514.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/38883948809.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i3c1qufptfsguf6f76sr933c3i/fosinavogug.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/benefubafaze.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/92698015629.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/94626449653.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/45149000385.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091600241253.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/79888763057.pdfIn PDF document text
    • http://net-work.cz/data/file/bavomegewi.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/24965533353.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161470c939a7a4---96407269952.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sudejazefogubexafanixu.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912010304583342.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vimitotobebodono.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/ratolivosozenixawurokuxix.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://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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 21720 bytes
SHA-256: 0163d160ebc3e9091386a119f48e047cab059fde3c8e94673ece7e8ee729f6fb
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 10636 bytes
SHA-256: 852f886c05dc69725c673c15e697d529d7e45ad6d700d814d82405b8f30697cc
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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