Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66930bc43b25128…

MALICIOUS

PDF

117.9 KB Created: 2021-02-08 21:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dff8e25b80f5480e6ba692580a6a2e07 SHA-1: cdc4c3281be5eba9b3b495281a18a339053e697e SHA-256: b66930bc43b25128e73e81b2d7d675ddab399c4f5ed515ff2c31124ed48bd3f7
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous embedded URLs pointing to external sites, characteristic of a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/wb?keyword=shadow%20of%20the%20colossus%20wiki%20guide PDF link annotation
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/tosubuku.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/joxumadesexod.pdfIn PDF document text
    • http://xakugitanaz.iblogger.org/h._o._l._y_florida_song.pdfIn PDF document text
    • https://pebizenif.weebly.com/uploads/1/3/0/8/130874023/wuvitepujiviw-tasaso-fejeviji-watomokobid.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/tajinogusimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemosufijubimup.epizy.com/crime_patrol_2019_hd_mp4.pdfIn PDF document text
    • http://risexogukif.rf.gd/zawasawu.pdfIn PDF document text
    • http://baduwujik.rf.gd/29803128923.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/19735080334.pdfIn PDF document text
    • http://folizel.epizy.com/the_cell_cycle_and_mitosis_worksheet.pdfIn PDF document text
    • http://tuxijug.rf.gd/papek.pdfIn PDF document text
    • http://luremugaxufarup.epizy.com/bulk_sms_software_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/kogavitejeraviloxotado.pdfIn PDF document text
    • http://wuvesuwenelagaj.rf.gd/fha_amendatory_clause_2017_form.pdfIn PDF document text
    • http://wobemiko.epizy.com/33656494952.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A4 6360 bytes
SHA-256: e0927a0e341cb80b0681bdc50b81e88467bd5be75a7568229248e998db1e1d6d
font_01_sfnt_off000178aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AA 5448 bytes
SHA-256: b7e5c573aafad825401bc4f0f80df6802a67f287e5053abccdfba156e207b8a7
font_02_sfnt_off00018b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4B 12992 bytes
SHA-256: 8715a53fb6d933f9851bd4ad28e8d2447f8fce5d1017d7479e4b3a1de76d9bc6
font_03_sfnt_off0001b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B466 16076 bytes
SHA-256: e7bbf0bca74f6ba17897bef3710127efb44abcf9298e3904bb3957032cc1d2c1