Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dd032e68966d92…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 08:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0d2cd42d4496823d45f401e7a406fd7 SHA-1: c772511a370aabfcf43a80d76f3edb10a85c598d SHA-256: 86dd032e68966d928533dd8080b7a4d910be0692a4d42da62072f28744ff0b5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=how+to+send+files+from+windows+to+android PDF link annotation
    • https://sunarchegypt.com/userfiles/file/fizerekit.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/71556729594.pdfIn PDF document text
    • https://dintek.eu/uploads/file/murerinenatupepuxi.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/buvubowurorudisivozukevop.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/kamuzob.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/70323556863.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/63923681077.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/vuxerikinunekowulipomofu.pdfIn PDF document text
    • https://quizai.com/uploads/files/63060730928.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/gipavewasijubonegukizojaz.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/9106066219.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/rabalirowuwexumusaluveze.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/12857963693.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binaxezarusi.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/7112470399.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/85540740535.pdfIn PDF document text
    • http://contua.org/userfiles/file/zivezilolofozuje.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vupalekajug.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/legevofofekog.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/82056161903.pdfIn PDF document text
    • https://basisangka.com/contents/files/18833589479.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/ripaweruduziw.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/4594919830.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_off0000bbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC4 10592 bytes
SHA-256: 8789ee7c625bdaa2c7ab32de7d453227aa5d230784fa831d74dceb05280c1daf
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 17248 bytes
SHA-256: 82a0e01d14472167f8ee6a3a443eaa012c587dced2ffb5868a458d5c584531bf
font_02_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1