Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffe9f3b0c6515d2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 19:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b486bda285e1936c06ad2f90f96fbb27 SHA-1: c85cd6b16ceecdc86f56d7d24b8e1bd962157a68 SHA-256: 7ffe9f3b0c6515d2fca08d4ac38e5cc24154c6f216032324af068b331164ae57
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm behavior. The presence of external URIs and the overall structure suggest it's intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/20302090736.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138821148eb3---37745137397.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/pofituvefevuvazakafaguf.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/naxadoxenirofebexafatoxa.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/37932839182.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/juzejaledikitewevatoki.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/92887084734.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/58247013443.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/noruxodokurufalewikujofis.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/15301477889.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-6/20210906194658461430.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jazefodazu.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/78706311250.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/28848221394.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16305538041727160916.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613681dfacba4---2783085747.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/87285939688.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/kawev.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/8566739705.pdfIn PDF document text
    • https://digireg.sk/upload/73195687913.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/funaranodiviji.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/poxebifajimimevinukujagek.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/guxomuraza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hack+last+day+on+earth+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_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10664 bytes
SHA-256: 3e021ac612c37309233c11681f15641160937e66ab6cb5aa1fa3bd3d1440d8fb
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 18068 bytes
SHA-256: d65346605eea7ac3465de367871022d45349f0deb53d9198618a3d93ecd06b8e