Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffeaa7c76d4c956…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d8c022f82a45703420eb0d4f17dee7b SHA-1: f3f1adf4ad8deeaf5bfcd761603df3bebc786118 SHA-256: 3ffeaa7c76d4c956a65883de26abbc3c9e2b21151ac59423cb11b1feb8876991
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery, as indicated by the 'PDF_IMAGE_LURE' heuristic. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable, suggesting a link farm or distribution network. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://henskeschildersbedrijf.nl/upload/positifabalepimelivitisad.pdf In PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/sozatuzikutef.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/fezexoroxanabolez.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/82260337629.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/21496088823.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/91205835631.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140149fe0076---xufidakusexebunamikigazu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/4688661300.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pezuru.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021914611229311.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/62542294404.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/67410245303.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zifoguzijijerowugu.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109041748362012.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/nilejitobix.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/39781308401.pdfIn PDF document text
    • https://okazionche.com/files/39829121614.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raregogisubat.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/88462414906.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3feb7b056---melanemopabapolelofa.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/fakafonel.pdfIn PDF document text
    • http://didopack.com/files/pobupetage.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/21819392836.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/78011253431.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161332071bdc0b---63532560412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dark+black+wallpaper+4k+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_off0000b0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 10744 bytes
SHA-256: 6b1342d384e8e910136820e4b40ba8f89b678a6e290207e0f5557f0d2d9c91d0
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 14384 bytes
SHA-256: a85b35307b3368e7216f4f61a95260e23bd81a8aed7eb10d88a06ed8b09848fe
font_02_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1