Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed1699686f78e3b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 23:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6065322ca829e00c3015ce0a7b3336dc SHA-1: 3dfb6a9528c7da6dd8f3205e3d0ca2d501a45048 SHA-256: 5ed1699686f78e3b74595ccb644bed7023a72413ce4d9c909820720e0437e13c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious or disposable domains. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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=convert+30+degrees+to+radians PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404eed9541d---lunuxega.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/29008641611.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/12359747737.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/18387817186.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_20D83DBD441A0051.pdfIn PDF document text
    • http://rentaruedas.com/files/others/30748594346.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/natelidap.pdfIn PDF document text
    • http://vswet.ru/f/27754079772.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/lagafa.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/nazesuwi.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/gowiva.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/52968160777.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/somoranipan.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/timuvapaxuvakuzabaped.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/95662995566.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/ribamatonuzonerix.pdfIn PDF document text
    • https://emenu.hu/editor_up/16422923936.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/21340805344.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/wegebadovenuxusenewelig.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/99749248182.pdfIn PDF document text
    • http://geoman.cz/data/file/41382562712.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210903170710.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/nanijabopesidelovoguf.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 18228 bytes
SHA-256: 0603fdce646734510ab9783e79a868918ad1a09ae7b6435dfeddcca552b15f9b
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10768 bytes
SHA-256: 62a42469c2f43088df18d2a0930442c155d68df3d4a2ddd3f263ef6001939fc4
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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