Malicious PDF — malware analysis report

Static analysis result for SHA-256 5142c824f0c46864…

MALICIOUS

PDF

67.5 KB Created: 2021-10-03 03:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bc148e21f8d7b8512ff0b37e2a655661 SHA-1: 94aad33b1d49990b84081ab940128c3aed1e27a7 SHA-256: 5142c824f0c468645a603a0f7327cf3f1e6b802b0dc83d473a465240af544cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=answer+to+question+15+on+the+impossible+quiz PDF link annotation
    • https://vozilasavozacem.rs/files/nafuxumesiro.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7c990157---51443228446.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/kaxiw.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/64153323305.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/72851451369.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/fabepije.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zekefipisamotidefi.pdfIn PDF document text
    • http://12333hy.com/admin/fckeditor_upfiles/file/2021092908384380554.pdfIn PDF document text
    • http://wmsone.com/eimages/file/83980831112.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/belulumudisufekojagifu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/fatinejeju.pdfIn PDF document text
    • http://e-hematologica.com/users/file/zesufoxaxunuki.pdfIn PDF document text
    • http://domainecomps.com/documents/files/dugavo.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/76945349224.pdfIn PDF document text
    • https://thenovgorodspaceship.andreirozen.com/images/files/zebekezesu.pdfIn PDF document text
    • https://lorus.rs/files/14629988431.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/mavutopopedizekajoxega.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/17752890068.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/nifapovetiwifanewute.pdfIn PDF document text
    • http://sin-hua.org/userfiles/potirigerataluleburit.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/levijazupulefus.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_off0000aa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 11052 bytes
SHA-256: 2d64dfd85d1365aed8e9dd4662d7423ec3c050a7a1bc95c65dfebc25e4b17ffb
font_02_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 14604 bytes
SHA-256: 9bedf9f401343e294d125f0bcbfce307f1f51653168e4b959da4307f9519fc66

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