Malicious PDF — malware analysis report

Static analysis result for SHA-256 412c323ab1cdd505…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d39a51ea5bd17fc4444c4af698c47ec5 SHA-1: 7bf6ba6f1ae4c5a4801e4ad8a8cb3c6e942858e7 SHA-256: 412c323ab1cdd505309dedbb4a44aa848c77e3a144f03d5569c163a4dc28daf7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm, indicating malicious intent. The numerous external URIs, many hosted on disposable domains, suggest an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8164eba3f---54174008384.pdf In PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/62743216274.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/56502337016.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/ridatefo.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/mosam.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/fujifebakerapam.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/sabunotajuxodix.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/kovotadafudirus.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/15078666470.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210913000213.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/96880760656.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/buxiridizodin.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/dulido.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/33148223503.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/sadigiwojexe.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/31731075224.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/69265669334.pdfIn PDF document text
    • http://xn--lenachatka-57b.pl/uploaded/file/zomepovemevopod.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/linifawumoxezifenopitako.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/gifepulet.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/74b9e0i2e5t6e415m0q2ioh767/popadoragexopafibuxov.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/ralivolopunuvovazuzok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=karnan+tamil+full+movie+onlinePDF 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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 10364 bytes
SHA-256: ac3ce72be20bd2a253059f26a192a9ed8558b878c1f6093148bb97331504d892
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 17072 bytes
SHA-256: be7e047f6fd306aaae9434fedc6780749e3fdbec6b21ca8e677cc520c1002584

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