Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8880d202837a002…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 19:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 215cbab96189e47cbeb468b8cfb57b8c SHA-1: d90b54f2a7d5a55001bcf25f889f2cb021347300 SHA-256: f8880d202837a002349c74f1da57dc6d14da0b13f2ddc89bc26b5f18898f77d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is likely responsible for redirecting the user to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.agencesramos.com/ckfinder/userfiles/files/46698043870.pdf In PDF document text
    • http://gzperson.com/uploadfile/files/2921324125.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/72461638255.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f997345af---58539171449.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/59761580600.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/kitadudepiterike.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/25766464078.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/towulalejinifitafefewibo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/94140881318.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150a9fd01b4d---lunadenumujuxedovivaja.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/38558625271.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/josuvomi.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/retidujafenafebadipiwen.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pubikowuliloruwajalexo.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/94152603913.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/riwar.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nemofukivokejelali.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/bilonugowikavu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/95733833336.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/sodapavex.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109080649511536.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/nurogokikobabelodifa.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-19/20210919232123624542.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/22848036539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=qut+map+gpPDF 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_off0000ae72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE72 15464 bytes
SHA-256: 90ba88593385fe321d929e91d273109148e31d17df554c834bbe6ace53d6a9b1
font_01_sfnt_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 9992 bytes
SHA-256: f43a3656a1b225a2a5bc56632bfcebd8497e830830f8a05c150785741b36580d
font_02_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1