Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba72a7201bc8807a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 12:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ffd91d7d60d165aa4ace7b1d5e4b890 SHA-1: ba11c1c6fe397ba2fa5a55cfd1fd6f4632ae6777 SHA-256: ba72a7201bc8807a7adc1c4e89b2e86382d500ff27522af75bbf11ff3ae52809
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support this assessment, flagging the file as malicious phishing or trojan content. The presence of embedded JavaScript suggests an attempt to execute malicious code or further obfuscate the download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bongoes62.dk/userfiles/file/41767763259.pdf In PDF document text
    • http://babyshelter.net/assets/upload/files/rekepesikamezedepidazexo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/nopajuditiregelosur.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5qpqaak2r3qpgnl81jobvd49p3/71607649384.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161300d611b4ac---lilironijodunugurojirixas.pdfIn PDF document text
    • http://hexindechem.com/upload/files/4304321899.pdfIn PDF document text
    • http://flomojapan.com/upload/files/dudogemironaredasapefawix.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pofofinaduvaruzukazuner.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/58603011826.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109140630359157.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/4947005047.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/29118613096.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/sifavijafiposali.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/wejonasutasasabe.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85394855216.pdfIn PDF document text
    • http://rnralpha.cz/res/file/wotafugadaviwubimulabupiv.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/pejepe.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/73729659740.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/lakiwubekekuxopaxa.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vefefed.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/35692336804.pdfIn PDF document text
    • http://yuli-china.ru/d/files/19166969498.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/mejisozadipumobubofogaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hd+video+downloader+apk+old+versionPDF 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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 18852 bytes
SHA-256: 21fff8c375274b23cab3ce92b2f4dfc39508ddaf28229c8dc87198b3d9e4705c
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 10524 bytes
SHA-256: daeedb6296efb9b821e7f209b827aa5026c4370d4907cbe7144ead0ea9127a58