Malicious PDF — malware analysis report

Static analysis result for SHA-256 82164528f7a88a9f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 23:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5023e4a85b28b2721e39bbfbb146abb6 SHA-1: 7fab36ff161fc74cfef69c667c203d21fb822521 SHA-256: 82164528f7a88a9fe7aa49efbefd86c38f1d0aa141e4534fd1e65dae9be9c998
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and disguised with terms like 'calculator', suggests a phishing or link-farming operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to distribute links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://maketmaster.ru/admin/ckfinder/userfiles/files/pekibamakuwabu.pdf In PDF document text
    • http://pttaccounting.com/userfiles/files/falilagusanabomemevazuz.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/tanukogatap.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pipovidezuzoxol.pdfIn PDF document text
    • http://turnyras.lt/Files/file/pedaxilurigowulo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614658d6c2ebc---mewakubeniwevezugejon.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/25598495351.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/49817661271.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/siwufidijuvawuken.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wafotuditefepalenetarabad.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/40257433087.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/91524266343.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/bebutor.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/zizujazate.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/53051494141.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/61594270133.pdfIn PDF document text
    • https://ksboutlet.com/file/files/burikefinepari.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7f978898f---44397129073.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/konapemapera.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/jexagazodiriwi.pdfIn PDF document text
    • https://unitjaya.com/contents/files/74988411302.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/21850697324.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/67266942151.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/16221988422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hexadecimal+to+decimal+calculatorPDF 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_off0000af9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9A 10452 bytes
SHA-256: 2f4eaab2cebbd4b2b6e8968987b508d86f544b9e907e2b1e6277ca05be60e575
font_01_sfnt_off0000c73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73D 17044 bytes
SHA-256: abc6eca2a8ca736e73e58af0621a167dd27e75fcda3b92e9e5977b037a059e85
font_02_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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