Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9773bcb31070d3…

MALICIOUS

PDF

71.2 KB Created: 2021-10-08 12:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97dac97d0eb6ceecb8f28907157eb39f SHA-1: 463c2e97ad0bb2b113c26b2f96c7da83fb2cd94a SHA-256: fa9773bcb31070d3d0e112587162e650d1d5d57d061a5b4c06a7722c174f749d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links 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://cructi.ru/uplcv?utm_term=two+of+which+or+two+of+whom PDF link annotation
    • http://railwaysrailroads.com/upload_files/files/jijurikagarewafoge.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/90504943771.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zivavebazepifosovozab.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jimejisutaduveza.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/12910732291.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/99207200816.pdfIn PDF document text
    • http://it-hair.com/userfiles/69856321114.pdfIn PDF document text
    • https://kaimano.it/file/bifedababe.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/junelakasevevodituze.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fb251b95---gazutanujoba.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/35717376694.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a50d670951---59986759524.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/ziziwifinarowonobokodaxi.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/97860188776.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/30649122418.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/zujoravapowibowikejebak.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/majadel.pdfIn PDF document text
    • https://vzduchotechnickefiltry.cz/docs/difewaxaza.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/9276427430.pdfIn PDF document text
    • http://519pf.com/userfiles/files/92388548183.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/riligoduradef.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/takezafasesun.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/6535960107.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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 17120 bytes
SHA-256: 886d943f69663c3df28b7c4661ce4e01dbe7084ad592456004ee950a8b91504d
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10040 bytes
SHA-256: 1ee590b44e6cd8fef33139fd408f8b6aa96dd1b61af7e8b7f713521463b8ba2f

Open this report in the interactive analyzer, or submit your own file for analysis.