Malicious PDF — malware analysis report

Static analysis result for SHA-256 12efb9c32c7bd101…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 16:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d511f814f14369e6d32e3309e242a48 SHA-1: c94f298b5d8778d5278fcd2fb8b702c7e7db1198 SHA-256: 12efb9c32c7bd101be9a86cb4d06a14572dff5c4f1014230d939a2f0bc9153aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, which is a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit users through deceptive links.

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://fokemale.ru/strik?utm_term=pathfinder+tales+book+series PDF link annotation
    • https://cdn.sqhk.co/kulukopupiw/YvnhdBI/50234049555.pdfIn PDF document text
    • https://foxesomi.weebly.com/uploads/1/3/0/7/130775893/wogexedujiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5fff4e57904f6.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/pigofim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_601d3af68b877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_605f0079567b1.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/Sjbjcjj/minecraft_build_battle_server_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/WgeBic8/xodopulokipipekoref.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/1c10ad3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemunaxeje.epizy.com/wuwosimusag.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_bbc0ab980e424285bf41cb3563e51707.pdf?index=trueIn PDF document text
    • http://zenulasomizin.epizy.com/afrodisiak_adalah.pdfIn PDF document text
    • http://xulivef.rf.gd/outlook_app_calendar_not_syncing_android.pdfIn PDF document text
    • http://furarojakak.epizy.com/axelos_itil_4_book.pdfIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_9e7849102cf047a292ed3301d3534ecf.pdf?index=trueIn PDF document text
    • http://pidalov.rf.gd/76013345303.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_536d96b4ff0f45bbb10715829d24aff8.pdf?index=trueIn PDF document text
    • http://fazajupozapufo.rf.gd/fevogaxukirutelogotofa.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_4228a845ddfc4c87a8f90c49c089927c.pdf?index=trueIn PDF document text
    • http://xilibosukotijob.epizy.com/batosama.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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5200 bytes
SHA-256: d8cc49f3aecc2eb43622eae741ba6e15b78c3e40053fecf31e31af50aa7c9be7
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10884 bytes
SHA-256: 77971390c668484eba4e28d4a728f0e1169a3c7f0240a3d911b21fd56ee2dded

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