Malicious PDF — malware analysis report

Static analysis result for SHA-256 be85afe1d3596577…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 15:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7090908bdb79ceb49a80c37c4c90e2cc SHA-1: 629ab76576ac3d426a1771cff5f04a78daadcbde SHA-256: be85afe1d359657787fb3e2fa3bdfdd1c5d4810fc373a2ff766d3f8b2ce383ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. Heuristics indicate it functions as a link farm, likely a lure to download further malicious content from one of the numerous embedded URLs. The presence of a 'download button' heuristic further supports this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://unitjaya.com/contents/files/52241572383.pdf In PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/wimej.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/479076640.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/58556213382.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/52952184699.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/nupenesixefo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0c78275949f0d18df42b61ab98fad1b8/zamuwen.pdfIn PDF document text
    • https://unitjaya.com/contents/files/79028041249.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/49600508889.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/32804896318.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/lamawaxufomejoz.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/76309513687.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/90188063440.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/85308658216.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/24077261326.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/14556820527.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/32436838834.pdfIn PDF document text
    • https://agermag.ro/mm/file/simomudopupuvozenosuzirul.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/xedutu.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/18647399926.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384d8167511---topedapokitizitizumedu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/xowil.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/murixevizu.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/35238804016.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/durapitojuzegilibisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jahangir+world+times+pdf+2019+downloadPDF 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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 18084 bytes
SHA-256: d314d3a77e99a49f1506cf3faa8c1b299a3705c98b15e38ed49fe1b99cd815c4
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11484 bytes
SHA-256: 42712935d7f8010793b213d0ac321ccee3d424aaf7015b4919dd0e9017d352ab