Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6907b11c0f99a3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 09:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b862cb2bfeb89ec0e07fbe6cc529cb5 SHA-1: 53d1ecaabcb64476117be3afd61effa01305711b SHA-256: cf6907b11c0f99a3958321896f496d3fc4995b23a183cc056575d3aced7a8514
174 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and presents a fake CAPTCHA to the user, a common lure to trick users into executing further malicious content. The document also contains numerous external links, many of which point to disposable domains, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://anchor-m.com/js/upload/files/55855592752.pdf In PDF document text
    • https://ijfbacknumber.com/editor_up/67503485147.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/jinizisijumowunaxovof.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318d1055610---toparirasasobiv.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/rilosunotenukakusu.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/mutofowakakadoxederev.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/16322018869.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/mijitomurutonuseb.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/60157354661.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/16205595406.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/37021683865.pdfIn PDF document text
    • https://rajaunited.com/contents/files/49326908237.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161395c8d8c55e---29955289451.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/68467702888.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/tijinopon.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210905202257.pdfIn PDF document text
    • http://kahasat.cz/data/file/xenataroguzuza.pdfIn PDF document text
    • https://lapakunited.com/contents/files/dojuwinepizenogu.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/23279290399.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/xuvibekufiwaliva.pdfIn PDF document text
    • https://mklaassen.nl/images/file/lefofimagogare.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/situworonoxosajugesa.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/medatejarod.pdfIn PDF document text
    • https://naves.cz/res/file/vufejotefelobefikit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=spider+man+unlimited+game+free+download+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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 18884 bytes
SHA-256: 72458f4efcee6f5ec0a653b5c8175829310749cf0abedcebe47ced53ff10493d
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 10936 bytes
SHA-256: b419505f0436801b59a0e876957b5946852ba72c4220747ebc99615f48472d97
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1