Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a44dfb16d0609ab…

MALICIOUS

PDF

68.4 KB Created: 2021-10-04 08:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6880622ceffbde2372a237e80062620f SHA-1: b88ce0ee7b680a28ce91ab8b3e963eaee5c18bbe SHA-256: 7a44dfb16d0609aba25811e44ea422cf59ec987f6978865ae0e37790eeff26e4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image overlay and a click-outward action. It contains numerous links to disposable domains, suggesting it's part of a link farm designed to redirect users. The document body is heavily obfuscated and appears to be a screenshot, further supporting the lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 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://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/98383226339.pdf In PDF document text
    • http://banghetretunhien.com/media/ftp/file/gutidevikamemebenu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/40650029529.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/56292458889.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632500209gMpH.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/lerenoxiridimatepitovag.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/76557964772.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e230a3267f---81725131000.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/52250738152.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/xudozisujinumebeladik.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25241048147.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/21702653433.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210903100538.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/suwomep.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/acen5o6b8m0o9asj5sjsq2vdsu/76191165493.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/luviguzaxezawetolupole.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/29596379147.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/15125532767.pdfIn PDF document text
    • http://veitali.com/upload/files/43278875862.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1632336772basudexewatewiwegumuxov.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/ravajumomoroparif.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/92209802091.pdfIn PDF document text
    • http://bankerz.in/qpic/files/biwibedaliletevaga.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/xolabexonufowiraj.pdfIn PDF document text
    • http://santinitravel.co/files/others/kogek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+choice+of+lifePDF 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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 9764 bytes
SHA-256: deb86db838c1c873b28f9d2c2bdd0a0ebc5350b2f1d1a7c696a2201789391f62
font_02_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 14540 bytes
SHA-256: 5dc1699679db1f5d1efb466a835c1a0c6addb36f9ed8d77917f7258bd9845855