Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0687587fbfe3368…

MALICIOUS

PDF

73.9 KB Created: 2021-03-26 03:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8a6547be951d3bc3f698e36c55a3ccc SHA-1: 5cf81aeb13d77ccc338837643dd29fe4c079db67 SHA-256: d0687587fbfe3368e16a8c07a36b46c05d018d2d738c112c6e8e1c49adec6de9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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/wix?keyword=stoichiometry+conversions+review+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/lojosexotak/PNjidtt/ahlamalik_williams_instagram.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/all_fruits_name_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/qidighh/90895710200.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/31851166471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_6005dccf6f26c.pdfIn PDF document text
    • http://wimebenese.getenjoyment.net/80526574303.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/65147667065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_60435362cf740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_3e543d3459344dd8afd374660392b9e4.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2d9b4b731ecb403c97f5e83f74319941.pdf?index=trueIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_eb28e16a08ac49c58fa3873b031ef268.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_47f6966eded942b4ad8b16cb7257db0d.pdf?index=trueIn PDF document text
    • http://kubomefewofumim.atwebpages.com/passport_renewal_form_2020.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/fokoj.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_faf462cbd8304559af6d66515f7b5ff6.pdf?index=trueIn 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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 5428 bytes
SHA-256: e841569be1341fd6c7e44a1e3d427821ba2dee0df465b14aa6a8c46816c8b86f
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 11356 bytes
SHA-256: 5d0f2983ea44d037d2950177137d762583c5d7f543f7d81119f8a4c31e2cf6fd