Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66925acc9b50776…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 09:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ded70055bd18b11cee31bfb4fcd96615 SHA-1: 5d30606064f4f2b32bbed8c45e7da3d745efcd81 SHA-256: b66925acc9b50776201d8398c1c85c91dadbf736615140465f264d22e0e04c4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The PDF structure and the presence of external URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=kny+mugen+train+streaming PDF link annotation
    • http://elitacasa.it/images/file/lisawivisuzigaf.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xukewugon.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/zukarekosibelaserorupipi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rizilatagejime.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/fojosowimud.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/tinofexomuxa.pdfIn PDF document text
    • http://medrea.ru/upload/files/36919758848.pdfIn PDF document text
    • http://pi-consulting.ch/download/33329139279.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/misazalob.pdfIn PDF document text
    • http://grotech.in/userfiles/file/kozolufibotapiwemobeb.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/guzez.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/zasunanesunusozome.pdfIn PDF document text
    • http://yensaophanrang.net/userfiles/file/48439644734.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/23665414887.pdfIn PDF document text
    • https://renewone.de/files/60185734916.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/93262971309.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94412625236.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/33890354265.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/93145100800.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/fufuwovurumame.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/79259453351.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad35f916c2---59129711849.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_off0000abd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD8 15068 bytes
SHA-256: e247117109f84e9c07d8dabf44b67ba823882e3ccfbb2049457b76e030cdc285
font_01_sfnt_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 10492 bytes
SHA-256: 576a32404c45d80b2afe9681de380e575d7da2b004b88b0f026b15de540c1941

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