Malicious PDF — malware analysis report

Static analysis result for SHA-256 24458631d73ee89e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 09:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f5f045dac58db205480f35e0d2cc9a0 SHA-1: 1cd1243a231ecd12a38fe44f7a092aeb8e7be479 SHA-256: 24458631d73ee89e15dc2cc595cf7ee8faac9ffa4ce4d7267da2fef07c985f4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, 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 URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=picsart+mod+apk+2020 PDF link annotation
    • https://duragloss.pl/userfiles/file/botubosobin.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/53554585501.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/65284620624.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902175625_1893804029.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/kamirotoxanoxila.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/vosiz.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/kanewedekedafavuxemu.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/86575793732.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/jovuzaleroke.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xigikosabanubupaleli.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/sojupejekepaxoxanibirulab.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613199c2e8508---72939523428.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/popegogik.pdfIn PDF document text
    • http://signauction.net/userfiles/file/37229579963.pdfIn PDF document text
    • https://viettrungson.com/media/Files/23603392491.pdfIn PDF document text
    • http://npas.ru/pic/file/jakadevu.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/dapotidiwudejavub.pdfIn PDF document text
    • http://ktcz.eu/files/files/64138231752.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/bijifibeduviluzez.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/maxejosenisiropivab.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/64505354731.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/rigiviwupovukola.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/80673257602.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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 10728 bytes
SHA-256: b36cdb1300811447a53262604a8b4d0fee1a40656eca347e9da86f8cc6a01469
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16344 bytes
SHA-256: 54101b5caf4a900e847ebe03c8714eeda09d23ee41353ca7330e28ce691b507c