Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eabb6a78741702…

MALICIOUS

PDF

70.6 KB Created: 2021-02-23 17:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 14ecb3d668f1071681e4d47a47aeb262 SHA-1: 019b60c25af733d65a9373bd146d00aa273e28b7 SHA-256: 98eabb6a78741702805bad52820b561086160d3d4db4544a7eefb0a42f4e65c0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. 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 heuristic suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/123?utm_term=this+book+is+gay+read+online PDF link annotation
    • http://custits.space/5388138576drmmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_6029e1a2c9703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd9c0c780484.pdfIn PDF document text
    • http://ukranews.site/graduate_student_email_signature_templatexyh01.pdfIn PDF document text
    • http://geniputan.66ghz.com/keriki.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/qghhcje/gomo_phone_coverage.pdfIn PDF document text
    • http://missunik.space/motorguide_xi5_sonar_interferencemswqn.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/7YJ8A38/word_search_finder_cheat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5ff23a5bca26b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5fe061e93dace.pdfIn PDF document text
    • http://braco.ru/exterminate_all_the_brutes_sven_lindqvistqq9t9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5ffb92b388128.pdfIn PDF document text
    • http://drive4mclaneaustell.com/zoxenesoxulasetojuwabauo08s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebelolejesupo.rf.gd/zidisu.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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 5344 bytes
SHA-256: d6985c7326cacd788da03b3eb4c18a1f1d3b189ebadbc14a69867a1364eea1f3
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 10284 bytes
SHA-256: 973951d383d86c2aca3da8c69a4d94e956b15914ec0c065586c60deda295b890

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