Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91362556254869a…

MALICIOUS

PDF

111.4 KB Created: 2021-10-05 07:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b169dc276488e4ab339583f304035a9 SHA-1: 5c397f8619615a61cb7dfb6f543459d68f99aa6e SHA-256: a91362556254869af6a43d6cdff8b520be203a510a32263b21b359d24a0c5484
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://catamma.ru/uplcv?utm_term=tommy+hilfiger+and+his+wife PDF link annotation
    • https://wupaojichangjia.com/d/files/zizosevojek.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/047dc6ad49be833ab5084b9cdef9d4d7/womipuwetotapawodabu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/zuluwalupevo.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/fuxebuga.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/jematumujezajitobadep.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/mozafaruwojalav.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/39360707440.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/53981114109.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/relugavobuli.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73666755803.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/86358603378.pdfIn PDF document text
    • http://househouse.it/userfiles/files/35398628941.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3fc1e03b---19299388281.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210916/file/16317796506405.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/64245259022.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/rajokolujenoba.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/dekafewuwaxojesetejivaf.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/vatonekomazutamemi.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/wiwul.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/masenukamagafajeronemano.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/42039646946.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_off000147a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 21068 bytes
SHA-256: 9b6e4dbb9aacd57b5f0a443aec50c615c34b48d32cdc0eba62d3badf7e9bc477
font_01_sfnt_off00017f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001974d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974D 10868 bytes
SHA-256: 7b5b194873f92d31af43f90584fd3dd2d89df2ed1832ae654bb29806e31a0123

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