Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fca3ad9ba2000a7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 05:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ed80fa08439e0b318cabc461f55f9553 SHA-1: 9936bfb7f722933e45f798be842a923788f2027e SHA-256: 2fca3ad9ba2000a772997181ee7b36d242fad1def068ef681f7914e984246176
134 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 embedded JavaScript and numerous external URIs, suggesting it is used for phishing or to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=bach+cello+suite+1+pdf PDF link annotation
    • https://geneolock.com/ckfinder/userfiles/files/lazelevisavepurojerek.pdfIn PDF document text
    • http://gewald.ru/content/Files/nugewetiwetesedukin.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/93237306716.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xezufevozowogeba.pdfIn PDF document text
    • http://hongdacable.com/d/files/88961499561.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/77640600729.pdfIn PDF document text
    • https://reha.bg/content/upload/file/6017076599.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109071414173742.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210906_18_53_31.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/45738811407.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/kiriboninisimalizada.pdfIn PDF document text
    • https://robertbah.si/files/file/30570824661.pdfIn PDF document text
    • http://only-svet.ru/upload/files/21875903897.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece0cce4e1---45498526592.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/7425552988.pdfIn PDF document text
    • http://palami.by/images/file/petodig.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/taramodobej.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xokazed.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/puvabamija.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/29587469032.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 18304 bytes
SHA-256: 17025eb8b9c4c96efc4fb336dd59ff599c2e789c268ca9f36fa564235896bc44
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 10716 bytes
SHA-256: a69061b7926761d70a98346c27854be4115705cfdcee43888e378925b3d54a7e

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