Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bffd4d2bc8e4a40…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 11:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9786ea426e9e1d4aa44d35e221c76191 SHA-1: d1f0bc21160f6b72621aad6569e9e381a964e6f6 SHA-256: 7bffd4d2bc8e4a4098d33dce16adf631014490daf7c83516201d5986688bd16b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laptopplus.be/app/webroot/files/userfiles/files/gajok.pdf In PDF document text
    • http://wmsone.com/eimages/file/somone.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/gupigudatoke.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mapivegelati.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307134adf25---77098211107.pdfPDF link annotation
    • http://biosite.ru/images/news/file/13072529657.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/pedimura.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/42826606907.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_000728.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/49426773364.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_2BFD0499974FCE2E.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed353f2ca5---71455276076.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/63514792332.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/munefa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/34b3d9073633e0b5b7b4c5fc99f275ea/28368999789.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vobivoluwaxef.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/satakiwamodipasoga.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/85895548871.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/31041325503.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/43027495506.pdfIn PDF document text
    • http://vladekoservis.ru/files/83609689791.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_043435_120.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/31355406486.pdfIn PDF document text
    • http://lblussana.it/images/file/70296174456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bin+file+extractor+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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 10456 bytes
SHA-256: cba3d4831bb50dad47ef1308df75e3ae43cdb9cc60b80183029b42b36b5c5729
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 18272 bytes
SHA-256: 2d0e3f7a7fbb1196fc1f3d75c964fe95df70286b2828eb86cc06fe0c5faaa28d