Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe16f62636461c4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 21:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49b8dbcbe26c54b79be7e3674b58f0ea SHA-1: 08617cc88219abd177f6feb1c4f574c03d00de7d SHA-256: cbe16f62636461c41c91facf02d60dc501764307ffd655dadb3656c4e48546dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, suggesting it's used to distribute phishing content or other malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high density of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=screenshot+not+working+android PDF link annotation
    • http://flomojapan.com/upload/files/piteradi.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/7635565000.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gunoxokexonovumokudikufuv.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/77213942345.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/fekejesejuziwaruvotul.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/lukavegubizizopozaror.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/gagikotojibexufibozo.pdfIn PDF document text
    • http://furniture83.com/upload/files/dipuribisi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/39856183592.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/xipupogidav.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648b967eea---52903165206.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/86515078421.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/30329233355.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/ririxivuwexegopo.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/muzajat.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/79905859358.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/mifilinulafunix.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/loxeraliposopu.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/mazozatowizoretoxaxuvi.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/fefurobawikokowedadovup.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/beruve.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161335219affd8---60222836648.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/pisubipepesi.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/39289363429.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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 17996 bytes
SHA-256: 3272cbf35057e637d8721d4333f65898bc5d5d7977730090b6113fc493cac8e2
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 10856 bytes
SHA-256: 39226b85565f144ee31df1905f3e7a6681447a3edc76885ffa4390a066723178