Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbc6bdf637cbcb7…

MALICIOUS

PDF

92.6 KB Created: 2021-09-18 09:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40b5afcb79bed7a6e825aa93c55b5de8 SHA-1: e9e2d7bed62410d99e01afaa453cf62fc357aea6 SHA-256: 0dbc6bdf637cbcb7b5bb44538d44ccb0d851f15041088cbf8fc61e1f6f124bea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by heuristics as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://eia-edu.com/userfiles/file/57170992146.pdf In PDF document text
    • http://archidaldegan.eu/userfiles/files/96596053626.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/vegoravurubejove.pdfIn PDF document text
    • http://adveotec.com/img/file/2627319035.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/96914437923.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/ninubovixujesokasap.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/berofejumerekiwex.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/bovimidodibozabi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a49530550---zerivimevaretoluferoxarib.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/93368608081.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/zidigisuzafine.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/38711329297.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210912225321969594418.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/paperavixixupixufavino.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/kabajo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/84793501448.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/51032297215.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/difalusinodu.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/13247675407.pdfIn PDF document text
    • http://kme-kme.cz/files/file/10104543781.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/63088077913.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xefatimutijezu.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/335003758.pdfIn PDF document text
    • http://medrea.ru/upload/files/19861507814.pdfIn PDF document text
    • http://355353.ru/userfiles/file/xijirasebiv.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/xupedopazuwatinuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=after+full+movie+free+onlinePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/37685545343.pdfIn PDF document text
    • 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_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 10192 bytes
SHA-256: d61bddcc4681debd26c4da5b4fd61a3d86d23d050245c78e25b936501eb49964
font_02_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 17228 bytes
SHA-256: 4ba9c996ad0fd95e2850866f20ecd883d8c6028a7a2b497ef8d8dcad8dbc8788