Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b000fa3a72c7da5…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 20:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c59fea1cca6b1c12a78ea44aae819901 SHA-1: 8a0917f36e1d21562f10cc3dd3e718ae9d8b4a45 SHA-256: 4b000fa3a72c7da554a7fc303858d6125a6578ba169b4b424fc939f981cd5b44
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are disguised as file downloads or updates, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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 https://huntic.ru/uplcv?utm_term=oxygen+os+updater PDF link annotation
    • https://dichvumoinoi.com/ckfinder/userfiles/files/kalidewudisa.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/duwarevumefemubulanagem.pdfIn PDF document text
    • http://stonebreaker.at/kudawema.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/41079417927.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zokufaz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b8b687fd---92829546550.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nokaxalaniralelofezapafo.pdfIn PDF document text
    • https://cubic.is/userfiles/file/84103296234.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/12465456860.pdfIn PDF document text
    • http://chinazzjx.com/d/files/botonakufirupujazugodom.pdfIn PDF document text
    • https://etimes.mn/uploads/files/nurutorepipulugazodeme.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/24267962731.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/jakobote.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/4426494354.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nurojoxisuvoremupilira.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/1947089658.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/fewogunojatutiruj.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/bekuf.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/38462836023.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/56979386874.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/jigijuvijojudasa.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/fezutaj.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/2316925914.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161356ee76a10f---14042785712.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_off0000b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB646 10772 bytes
SHA-256: 769dbf8783f1852ea31d49a8c0acc61ad92478d5212abc16a3a869d99c220988
font_01_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 15696 bytes
SHA-256: 02afeb10705a24ac372462eb620a6fa98a09f1d171a847da313e4f72919703e6