Malicious PDF — malware analysis report

Static analysis result for SHA-256 feeb1e8a08df7b5e…

MALICIOUS

PDF

98.1 KB Created: 2021-04-03 22:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf0bb108a25621be871795d524075cbb SHA-1: 12b7a951e5691bb5c99a325efdb638d39da0673d SHA-256: feeb1e8a08df7b5ed25f04526da86a7cda4521e151450133d9343a915b800e55
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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.
  • 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://jumiwimov.ru/123?utm_term=algebraic+expressions+and+identities+worksheets-+grade+8 PDF link annotation
    • https://cdn.sqhk.co/gadukupuwe/djVjghh/todo_listo_en_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_6048e2b3a4f49.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/lghChch/blockbusters_online_pvp_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/iizRsOK/demonstratie_viruswaarheid_15_augustus.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/dhjghie/rugomakusetarowubotule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_6048df16aa254.pdfIn PDF document text
    • http://lulemaxig.iblogger.org/61336546274.pdfIn PDF document text
    • http://pifofumega.22web.org/90655757800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5fe8865033a80.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/ieJxOeF/25731944468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_d0a83df524c8467eb6e94563292a8f43.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_dc0b52311bd04032a22a9c5f2d29e5d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f366ba89-4209-4926-b4f3-99717773eb6d/lipukonifuxar.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_071a1b7b29784d13ba1ea28bdb7bcd48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63e753c-6830-4f8e-b9e3-f920afa548bb/zidibirojak.pdfIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_6021b1f905b041ada484327b5a798360.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/437256a9-50e1-4a71-a8b7-ff2e6c907752/bollinger_bands_forex_trading_strategy.pdfIn PDF document text
    • http://gupexofuvesok.epizy.com/lasumoxuzapebojake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785fcec7-4f8d-460f-842c-e5af6e2923d9/luzakifowene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425131a7-317d-416b-9467-3e0ddf5ae94b/bemebatujufefapesil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d88191-eb82-4fd2-8b16-b137ee13f344/nesotarovatatijebifolusum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 5912 bytes
SHA-256: 1591798797b6ff517cff17cfed6e06d42e043f07a29a203b5e12fd11fc81be46
font_01_sfnt_off000152a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A5 11780 bytes
SHA-256: e987de3f79ab5108a66417e1e8f4577aba879614688bd9982f6ee37010ace7c2