Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb945990a1258e95…

MALICIOUS

PDF

100.7 KB Created: 2021-09-28 22:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9ea7b56b811f8c87c161353687bba56a SHA-1: d0cf9732708867e35c45303b6a89198da556a20e SHA-256: bb945990a1258e95f1ba245be05c14e1d298d3ea90faaf2034fa5f81553755ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=webpagina+niet+beschikbaar+android PDF link annotation
    • https://allmassage.net/upload/file/20210918224448.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/lurumepataso.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/tenub.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wamusiwifinulosilatapofuv.pdfIn PDF document text
    • https://funbugs.ie/files/file/busizuweb.pdfIn PDF document text
    • http://josquin-capella.de/download/15410501337.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/fupabataxotudaz.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/labekitelepajorilixobenir.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/peputezemevajevusejawetir.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/pefoxajebugen.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/nagijimujuf.pdfIn PDF document text
    • http://clingac.com/d/files/70006624463.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/73532116914.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/45310347993.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nofevegasilasa.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/59592019167.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/9956202957.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/wibumajebuxuve.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/mupuf.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/98983142025.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/25987780859.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/9738268539.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/65624465098.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_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 10972 bytes
SHA-256: 9b9a9340726e0812931ecb46f989dd18edda1703d62666f080ef2998faa96c55
font_01_sfnt_off00013844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15056 21324 bytes
SHA-256: 2f80c305954d96797de4512b6dd21a241ad87b9285076df43e2b62c40bf56e47

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