Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5311f5e9388f933…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 23:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbcfe94caab01e1256af72b990138734 SHA-1: a8ee700bfd65a1b7d144f3e59aa4dc29eb0b54b1 SHA-256: e5311f5e9388f9339fb92fe954020aa0c893eeda8d67797ba8ae8165a5ac945d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to disposable domains, characteristic of phishing or malware distribution schemes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm on disposable hosting, further supporting its use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=free+visual+skin+ml PDF link annotation
    • http://naszemotyle.natura2000.pl/imgturysta/files/61522646997.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/11128601890.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/64760294752.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zifegaxuk.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/fupufazatalolab.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/desipob.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/xexowon.pdfIn PDF document text
    • http://metall-press.ru/files/48164087436.pdfIn PDF document text
    • https://vientangluc.com/upload/files/rajamo.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/tirujowavab.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/92081809130.pdfIn PDF document text
    • http://zubrcup.by/files/files/tabisogomajisubewojijini.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/beluvinukuzojokejurorasam.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e17dda22ab---remakerizux.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614eda501b625---1214483586.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/27049087517.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210920055237.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/lefelotitasarenel.pdfIn PDF document text
    • http://podarox.ru/public/files/26151970949.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/moguxujufeg.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/47515071739.pdfIn PDF document text
    • http://fitviewer.de/files/file/xatap.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109011324506122.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_off0000aeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEE 15908 bytes
SHA-256: 3be974ee1333a611c9344b000a62511ab46d529faaa4d53b819d203b9b7ddbd0
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10288 bytes
SHA-256: ddbd0df2c74ca40eff01568c7e2d3c75e2dc8f679b438098237c1b7e4d26acd1
font_02_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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