Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d6272c4e17b4d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 23:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 412040c28ed80527d7e4ae4170ec82fe SHA-1: 37bd885d4986d4503fd9cb65af14aaa8df69683e SHA-256: 790d6272c4e17b4dfb1dcbdea761c9ad10a34cb35379140927e766fe973cca6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://bedrucken24.de/userfiles/file/wonusog.pdf In PDF document text
    • https://insolite.lu/img/userfiles/files/63458122312.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/30949284695.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/25044534652.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10425909653.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/78328762829.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/waxalopupakugixi.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gisewawuk.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/51590043940.pdfIn PDF document text
    • http://airmon.hu/images/files/86205806941.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/6359510294.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/vibudunakewisitesafefefe.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/tukalolawuwuwujotunev.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/15285879557.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/28729130837.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/90976755658.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/15393540305.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/76465647107.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631416663.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vunaxozaboteguwedu.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/verebidok.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/taq9trg7feajbdlci0jlr6vj1u/47480351194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=common+phrasal+verbs+exercises+pdfPDF 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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 18080 bytes
SHA-256: 67ec28a343873a4ac82414d8988f73908e38b9a7a92669ff97fd6adb46b779ca
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 11128 bytes
SHA-256: a18d3c1b503d83fa826cf8f17da5d16689dcbf62e92e6b4590b472c8b4ff3009

Open this report in the interactive analyzer, or submit your own file for analysis.