Malicious PDF — malware analysis report

Static analysis result for SHA-256 a908936329f852dc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 21:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ea2e1466ebbd9af9c496e3a62af1ef3 SHA-1: 8475b995b0c4902b0e595da16d5dc8fa711e6a0b SHA-256: a908936329f852dc43bd88e75a9458e3b206fa7edc20c2c230d462f7680073d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to deceive users into downloading malware. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133632af2db0---55732995141.pdf In PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/woduma.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/29782183215.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/fudajenamejunajalafadogix.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3d2e591d---11363993619.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/mufilosuxe.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/buxarobifesasetabapiraj.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/fonabejefojizopiwa.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/95409236015.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/nimobede.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/kuninajix.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zatepepupuruk.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/57582500574.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/veluvugaxop.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/mabupudunomugakirike.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/80282178733.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/zuvas.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_5316E60D29D84988.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/81715197136.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pabedas.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/femuv.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/11206896542.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/lejifuwozagaxawitamas.pdfIn PDF document text
    • http://a-pluset.com/userfiles/witefixitazazodomazilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=font+creator+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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 10232 bytes
SHA-256: e51214da2a31a7e7a34500b720e3cff34919ed5666536a51da4d44d68cc21845
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 17828 bytes
SHA-256: 8f10173205487fbf0ffa79ceac6ea2bd7cbfa0fe043d5dfcd3408c72e8bc73a2
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1