Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d464e2e08ca2126…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 15:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8550a1883d00c05f00e42c070544bb8 SHA-1: 030abc2539383a435789bf252116df9892b71e31 SHA-256: 1d464e2e08ca2126bbf45a9c6b3a670f0f46e3c1764a2145a6c24db36adee9df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm designed to obscure the ultimate destination. One notable URL, http://hindel-relax.ch/ckfinder/userfiles/files/xisenomodupafoz.pdf, is identified as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://hindel-relax.ch/ckfinder/userfiles/files/xisenomodupafoz.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/53915521400.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/nenukekarumekalasimoged.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/49746517391.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/vinuweditimubajedesel.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9f60dfb0---71641803318.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/labilenavovudivoti.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/bakafusivanuwasenu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bodafobomuf.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/72854367716.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/rijixexogepekonup.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/5472714952.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/mipimu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gixajitisebafazaseru.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wujidusudebofolixebopora.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/90407490082.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/94307076532.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22863783098.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409a034229---kixugasudapobufenuj.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/58785458186.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/dewejulajojije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=highschool+dxd+season+1+dubbedPDF link annotation
    • 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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 10836 bytes
SHA-256: 31e11f3559eff28060fc454d8b6c698cc8f2235d37d2f3ed4acf11c53388c3af
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 18072 bytes
SHA-256: d84e7443888028ca63f1abe29169b44f767659bba425a217fa9c4fad272f0d4a