Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9886684660d974…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 13:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47150547d0d3ed1afe62a7abdb6f215 SHA-1: 2e25a8481ef33cb1510be75a26ce106bd20ad493 SHA-256: 8d9886684660d9743f23d67979bb0f520e4bf17c25af566a9b997f6a0aa29e72
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=golden+sun+dark+dawn+djinn+location+guide
    • https://cdn.sqhk.co/tamupoto/jaQhbhg/gujuzadipebekamizet.pdf
    • http://manybigs.space/tetorehy6v2.pdf
    • https://cdn.sqhk.co/naliwanik/aJifNif/tik_tok_videos_telugu_download_naa.pdf
    • http://wiinorama.website/wozuzuma4rtkf.pdf
    • http://easterthjg.com/breadman_ultimate_plus_banana_bread_recipecwg2z.pdf
    • https://cdn-cms.f-static.net/uploads/4416934/normal_602d3c7eb9bf6.pdf
    • https://cdn-cms.f-static.net/uploads/4486197/normal_6054e96420f95.pdf
    • https://cdn.sqhk.co/pesuxitum/ieghgiB/29107699437.pdf
    • https://cdn.sqhk.co/savunowudob/jeUNhdA/gacha_club_oc_challenges.pdf
    • http://salonly.xyz/lusasegaziwedovotet2cns.pdf
    • https://cdn.sqhk.co/donaxewon/haghphi/shares_in_bearer_form_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_9b13f48b645546e0b2f2f934863f7303.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_92587f3be36b46b5a7c8a6b872ff56b7.pdf?index=true
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_6f00086fed854186baf1d9e54b68b2d6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e928.bin
111355f21b9ac1c174dbc5944bba69f452faa025520fd807cb091d06f2009214
pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 5372 bytes
font_01_sfnt_off0000fb9b.bin
94b1e275bf8866a5bca30b19973900459f6a8e6a7072b4e829fc5a6314981570
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 10576 bytes