Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b11f779f31b163…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 13:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88b0bed1f907cb4e1000b146f5c28225 SHA-1: 19d043c0cb5858e14ad67b86d7d8984aac14a8a8 SHA-256: 30b11f779f31b1638e30e5df539576094abec1ac13aa7efb8a7c1259c37560cf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded 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 phishing or malware distribution. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=surya+namaskar+ke+12+mantra PDF link annotation
    • http://xboxheerlen.nl/userfiles/file/81131173120.pdfIn PDF document text
    • http://boxethai38.com/upload/file/fufinegazunanoxa.pdfIn PDF document text
    • http://tid.vn/upload/files/65781186959.pdfIn PDF document text
    • http://stromzeleny.cz/file/fopazoleje.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/jawewusepatifujidovug.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tegimovozudopi.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/labapixexara.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/witido.pdfIn PDF document text
    • http://bienbao.org/uploads/files/17219668535.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/jorowuzobefolumizu.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/luganotewuvejovevidowipag.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/zuzalijifulotekumavixex.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tebisuviberogok.pdfIn PDF document text
    • http://msiutilities.biz/documents/xewepigatewalilo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/67110906981.pdfIn PDF document text
    • http://xycrusher.com/d/files/gojekujowefagomej.pdfIn PDF document text
    • https://protrialse.eu/files/files/xopasaxuxolojorojumi.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/dikajagoxakom.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/c63qp82dfugce0h63a436024jt/80969857971.pdfIn PDF document text
    • https://dm288.rs/slicice/file/fenewetotodotinire.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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10564 bytes
SHA-256: bae578e813d0a9199e6f82ff8bd7109c2674dc699d91082b98b2d10147941f71
font_01_sfnt_off0000ca36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 17516 bytes
SHA-256: 4c251566f47a7705102948df71e45c32e5893d88e46324ef3a3ed342b18fe7fe

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