Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b71cd0450cd5090…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 16:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47976c191c996da8eea4dbcbdd5d2958 SHA-1: f2a560f72bf2e53da7ed15e017a801e5ca01fccb SHA-256: 9b71cd0450cd5090f473a974a7559cc8ae68f7a7facbe40524d8859c21512bc2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=adb+device+driver+windows+10 PDF link annotation
    • https://lyna-garage.com/htdocs/cljr/data/files/10709788667.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/81288341939.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/jibuzenuruwufolibekefogi.pdfIn PDF document text
    • http://cabini.it/userfiles/files/8783728913.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/28895529424.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/90887513393.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649a9e58fb---xifetilalafonudut.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/60916473469.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/puxerufaxawugenukem.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/79691209255.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/mimarida.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/62227588660.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/kivokukopu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/17673993815.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/wetoberewigatedoxikilega.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/luwixepavadepiwivejamuto.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lb4lh93g3jj43m8pas59uve366/96622024567.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/tudususuxog.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/riwusoxasitav.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902145254.pdfIn PDF document text
    • http://stylekd.ru/files/11381344102.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/xexubotepora.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10504 bytes
SHA-256: 693e5eef6462294213a6974aabc97bb7df5b7189e14803d944245fc640f90bd5
font_02_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 19132 bytes
SHA-256: 0ac8f0b3f4a12230fa0fabe8bff718acb3ada87fc30db20917f93b2f58cef397