Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f71424b67f46f7…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 00:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 872b7f607f656acebf80998bda5262fd SHA-1: 424ea21387ac220d5a1efe4dbb243fe509ebf848 SHA-256: 95f71424b67f46f7d783019eb51c7aadad0d7fc14f3a4a0183d6a57f213b6a3e
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adasbruiloften.nl/userfiles/file/42458844817.pdf In PDF document text
    • https://dongcohonda.com/userfiles/file/sagikuravapiwonatamivoza.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/zujazodu.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44975699399.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/31763028177.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/najenamalosev.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/63962858311.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/topukomufaluzumomugapumuz.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/78608569918.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/9481087521.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/desobimagumivupako.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/bodukatiwodigogibamuj.pdfIn PDF document text
    • http://popeyebio.com/upload/files/gareforisifuzozifise.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/xofenemibosokilubebi.pdfIn PDF document text
    • http://markone-tools.com/upload/files/buroxaf.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/lapezeworararo.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109250747157437886eccjo7y1pmv.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414665ab5b0---pikagesujugarowawutij.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/doganawavazakivegaza.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/suxozumelotixezo.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210926014759_dbj66r.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/nodatedifevasifewivut.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/fafaba.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/27508579839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+backup+all+messages+on+androidPDF 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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 15296 bytes
SHA-256: 7b8cf7f4269a9f5098de072776afb3129206da79e7c7cecfca98521ef1c8263e
font_01_sfnt_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 11264 bytes
SHA-256: b4ea8ed6197ef24cb064a45364ea19dc4cd66454783ab5e7f56f4fd28f0fdaac

Open this report in the interactive analyzer, or submit your own file for analysis.