Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f289c26c8b19d07…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 23:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3576cc410e6a9c06a3cdb3fcf3bd487a SHA-1: 4d1e17bf78910da16734f540e6943c75f6c1d275 SHA-256: 0f289c26c8b19d0747e96bc8c21a3d0465c75ef64b98aa4ea6105d76df989216
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or credential harvesting attempt. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, indicating the document uses time-sensitive language to prompt user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=cbt+for+paranoid+personality+disorder PDF link annotation
    • https://iwanbim.com/userfiles/files/23362534229.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091504375497.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mafewewewetowew.pdfIn PDF document text
    • http://villkasz.hu/editor_up/baziwitepaminokumevo.pdfIn PDF document text
    • http://lulanjina.net/upload/files/livimixak.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/zoxodisosupevixukener.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/90835648952.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/xepovexi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/vanijonomebi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416876d52f7---wosopevejo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/ritetalakamabajuno.pdfIn PDF document text
    • http://riversedgefm.com/files/file/minudadoputinidel.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dofap.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/bugetuzenajalegosu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/63443997695.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/95626141420.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/naribadavu.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/17250938845.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435ea302997---sinaniwinopufuvajagedanop.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/xirozi.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210916_144730.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/27521247676.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/3734550001.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/28624845884.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/8342101935.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kepuwipejekodakib.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_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 18060 bytes
SHA-256: f509bc4d41fdaea9aa65f700b86e0af5db8c3455a7a1a73dc97106cb86e11075
font_01_sfnt_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 10776 bytes
SHA-256: 6f7b9b295166a418a8defd22af9ee5e44fa8f5d5e6b9ba2c6d98e79fc9454c4b
font_02_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1