Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2d300fd37b8f7e…

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 07:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1284e3c9344c106395420f1338cb66fc SHA-1: 67c9f3a25594f9c3fabc27f8d4b179ff7ebcdf2f SHA-256: cd2d300fd37b8f7ea5d634edce4bfb4a405a1abcb5afb97df00c19afe4ab9aba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, flagged by heuristics as malicious and detected by ClamAV as a phishing trojan. It also contains numerous external URIs hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://philabc.ru/uplcv?utm_term=scrum+and+sprint+in+agile PDF link annotation
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/58674390072.pdfIn PDF document text
    • http://homeopathyhk.com/files/dunik.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/gokakebufunupapebade.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/74690942769.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/45930870098.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/74150939982.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/xufetutejurakepunimasoror.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/1604329610.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/pugivofupefeju.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/gigexogafiwapuxusogoliw.pdfIn PDF document text
    • http://gibisch.info/files/files/1218102991.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/39486123740.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/27447399772.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/24968805051.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/05b6e56739860840eae24fe4a79670f8/balez.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/24088291316.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/63436696186.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/33845381712.pdfIn PDF document text
    • https://kapefashion.com/files/files/xoboxuditagarusovijawepa.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/ratigewivokoweru.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/61873915114.pdfIn PDF document text
    • https://kokomanis.com/contents/files/nonado.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/kejgqkdelpbchteiap1l66qm54/1531210942.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/marevixukisalika.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/76493913443.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/zitugigunuduvomo.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/wularojusabodi.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_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 16836 bytes
SHA-256: 61d175adea10fbe293c36858f0931a48cccc75a97484b69f72d976cd909306b3
font_01_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 10912 bytes
SHA-256: b1c110b88a89936756a3aa21a0a9f6aa4048f12a2ad29723f1a2f141bd01a8c8
font_02_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1