Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb83151d273ce752…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 03:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6b755caa48559daccb09fc85b8f5b38 SHA-1: d76b3232428d4f29482df473f7699c1232f846ea SHA-256: bb83151d273ce752766f0247cfb2931f2f6f2bd0edf12999bd9f2b5d2f3efcab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to PDF files hosted on various domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://ctkupavna.ru/upload/file/61426691109.pdf In PDF document text
    • http://maksimetall.ru/files/fiwexawibunine.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/wewiku.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/viviwojoxazesuwe.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/67670096724.pdfIn PDF document text
    • https://hssanesteban.cl/files/xubabaxewazexa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/69107633476.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/rusus.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/timegumagexanupuwemom.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150727c1c108---totoxop.pdfIn PDF document text
    • https://olterus.org/contents/files/76146055590.pdfIn PDF document text
    • http://atrsara.ir/resource/files/zogodozakepeke.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/96802873983.pdfIn PDF document text
    • http://strahyi.ru/images/file/fizojetosanepusoxiwo.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210927220503_1021579125.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/30650657160.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/4131446004.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/tirewetubepuvamexoranola.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/vapuzafozap.pdfIn PDF document text
    • https://ms1oke.com/contents/files/vogatevupepuzuzugorolitij.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/55876808976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mobile+uncle+apkPDF 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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 10328 bytes
SHA-256: b7df510dc58939cbfab037077adaefa18f4bded282ea85962b54de6ad2d9651d
font_01_sfnt_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 14844 bytes
SHA-256: 4b96f862403553650d9e505c4418c9150ebffa2a4b0e7ebdea2825bcf3e34af0
font_02_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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