Malicious PDF — malware analysis report

Static analysis result for SHA-256 6500eb8c460be919…

MALICIOUS

PDF

77.2 KB Created: 2020-11-23 02:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cf7703e016db6667d19c359642724022 SHA-1: 5bd44906cd6d430406a9c848d0aacd7dbc639974 SHA-256: 6500eb8c460be919895a44f2642b0d28e42835be2e8900538faa21c64fbd7aa5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafficel.ru/123?utm_term=fireboy+and+watergirl+unblocked+at+school PDF link annotation
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/kuvilibiwepifek.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/bujawaserum_zubipibuguwa_pusawukejuk_mupixixujuwijok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5f98c0c28c227.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/togajibem.pdfIn PDF document text
    • https://xakepimefinawam.weebly.com/uploads/1/3/4/9/134903333/rujomubuxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5fbad15b2b8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f93a3cc4de14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_5fab04f5e30a1.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/sojarotikidebo_fukigimuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vukumesoj/management_accountant_job_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/sula_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/nikhil_wagle_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/kotor_modded_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/leather_skyrim_id.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/69334756668.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 11320 bytes
SHA-256: 8b3473d3d6fe617442161cb9712442a14c618493660e175fe74ddb03f4460731
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 5436 bytes
SHA-256: 4cc0729e5e6c7cd6757515904db74c1140e4d05d450b7497f0ab06d40f236755
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 9952 bytes
SHA-256: a911bc510f111a1e252b13d8b5b36999cbb63dee6e5bdf2cd62f7299a8c5df50
font_03_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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