Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa7618b2d24d91a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd3991efd3ca1e45433bb37aead81709 SHA-1: 286a412f24d4d42c04d0a87af77d494962a2c597 SHA-256: dfa7618b2d24d91ae32efabe8d630d28b9dbcc4abee6ad566274cc27bd3c0a74
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, and the ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=download+game+football+league+dunia PDF link annotation
    • http://richmediahouse.com/admin/uploads/file/92423446720.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/juxigaxup.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/wegupegosuwa.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/valopamonivexotetobibu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/85559019375.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/dagatupuneralibunalosum.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/32861295384.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/titagenobubipisibewogi.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/renerukokegoweped.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/32468064696.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82fbacbc---23673591164.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/baweja.pdfIn PDF document text
    • http://allycatering.com/userfiles/sepaxire.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/xejib.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/dogifewomamazuv.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d7aa67e92e07c532bace02e29f6c6529/67680353199.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/ruseruredomiwefirosi.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/wisogifipaxuzujojo.pdfIn PDF document text
    • https://davnosti.ru/upload/wovanafibiwitojiwuja.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/61602392244.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/8012763622.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/86049658377.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lubafufojab.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/nakodabeximezuneve.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/juzatodepaxene.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_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 10756 bytes
SHA-256: d2eb4109ee36e5370d449370b703614b71584713318f25f5c5e52b6224c2028c
font_02_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 18692 bytes
SHA-256: 566fca4bf8e4a8428570e5cba366dd73c03338cd80b1c8f10dbb63e281fdbb68