Malicious PDF — malware analysis report

Static analysis result for SHA-256 2095de6077acedf6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 22:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8156565600160c392ef3d4aabf961c58 SHA-1: 1775e5dcc44fb0e4d897c1e56235faa8c6702210 SHA-256: 2095de6077acedf61848a4ef4e65b614f2fc9f32314e902ed15aea03610bde6d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including a link farm heuristic, suggests an attempt to direct users to malicious content or downloads. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://master-stroi76.ru/userfiles/file/60635569513.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/notafazoximefonigaf.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109020523159038.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b26b79215a---59809593045.pdfIn PDF document text
    • https://steammining.com/userfiles/file/3554371652.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/2875777228.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/60762958638.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907142701.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/25149230216.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gabifizofilinuxaranirale.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/25906058979.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/wobubupasarowifinekima.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34e8eb06d---42249923885.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210912012719.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/pudoramazaririvi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/35859085337.pdfIn PDF document text
    • https://remini.hu/userfiles/file/30877330065.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fatenaxed.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/nadoxileg.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/tesovuwitadino.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jukumuwewono.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/sobexekajut.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45379492071.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/53845138964.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/93853205436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v5+highly+compressed+for+androidPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 17680 bytes
SHA-256: f0a40d6af428f7969128437a4a53b300b218c8abec980e316093ed1d3619c839
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 11420 bytes
SHA-256: e6cdfdf3103d828e74b7d43d7b854ba742c6669bc8e659ff4040f5a28283de16