Malicious PDF — malware analysis report

Static analysis result for SHA-256 c274a7427aa32923…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 02:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c1bc2771a800b5ab9e49fc24d52ee9f1 SHA-1: ccb21c7ede6834c9ae5074d56b89c6ffa234c2b9 SHA-256: c274a7427aa3292393288e12c58467822376308e730f64b2e314eddd3e992d03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, such as http://timeyear-v.com/userfiles/file/jakiwozilevimo.pdf, are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://timeyear-v.com/userfiles/file/jakiwozilevimo.pdf In PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/bewiruzir.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/jatekubatoxanosilo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/jositanagevix.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/lasafi.pdfIn PDF document text
    • https://funbugs.ie/files/file/texekotixal.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/gufixinegibewovot.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/74453693179.pdfIn PDF document text
    • http://turatabor.hu/media/74958861405.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jemegakubemogejop.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/lodasoziwiregipuboruta.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/39732220218.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumazovezexo.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/54604443213.pdfIn PDF document text
    • http://dentali.cz/files/files/jizix.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lilosikubotobizunumuvedaj.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3363b06e---jaxidupibajuwerukot.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/dodekatepuxikenatomaxa.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/58180503806.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/2143025591613a7b1657417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+11+how+to+close+appsPDF 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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 10732 bytes
SHA-256: 60ac6e66d075a8fd40bfff259b4ce3b526902d5d1953941b11ad1624bdaab00f
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 17448 bytes
SHA-256: 4790e40211e5d47f6ac54056534c9ce47388c59de75af725f41984309d2931e3

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