Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ea81784171ba29…

MALICIOUS

PDF

74.2 KB Created: 2021-09-28 03:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7884b8f812b108a37e9d2f0031ae0207 SHA-1: f4685060e584ecd72fff7aef4f8bc01063c7c630 SHA-256: a6ea81784171ba29d56a8a305cbac675d777aa42f2ef89ceb606af5601055319
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://xn--3e0b556bhrbowi6undva.com/ckupload/files/bezikozagidev.pdf In PDF document text
    • http://cen7dias.es/userfiles/files/ratabuwus.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87286298007.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/jozipupumelokupetob.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/gixitazijiwefejoxozemizin.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/mavudomeduvezebidunanojaw.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/63669308495.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/20632358566.pdfIn PDF document text
    • http://cwesp.biz/upload/file/takefuvoz.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/madapokujeraxubixirenabu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/67612850283.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sulizozutonin.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/vukimikowedapa.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/nijomegudibaxenokob.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/semot.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/kivanotijaxapuw.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/99212292444.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210926_E648683919798627.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/04ad3798a900f7f23ac0c20169f5ab8e/78612077246.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/xoxawudi.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/10097696100.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/biwedavibomonuxilonajituz.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zudebivesabusoluwu.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/seluwosesanotexebozisati.pdfIn PDF document text
    • http://meskerjager.nl/media/files/68924746084.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/sujoxiwuxanujidemebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=user+agent+android+tvPDF 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_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 10452 bytes
SHA-256: 5b331e1b33134838cab89ccbb07a7aa8e84d52a4bd8aff665f8e5eb8aa8481ce
font_01_sfnt_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 18984 bytes
SHA-256: dc53aad74bf1c085a99ed09a44afd265b1c5589b0b1342f69e2dd5a628527b35