Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e59faa760fee4b…

MALICIOUS

PDF

74.0 KB Created: 2021-03-13 21:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 39c604af485fb39d47e6151b22506b79 SHA-1: 2865dffe0a42b177671503bc0f3d3c67627c8a14 SHA-256: b1e59faa760fee4bd175b7981e736e8cc7465dedf2a7f19471ebaddb7b938dc1
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://baarspo.ru/strik?utm_term=is+there+a+difference+between+a+buffalo+and+a+bison', which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, suggests a lure related to a common search query, aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baarspo.ru/strik?utm_term=is+there+a+difference+between+a+buffalo+and+a+bison PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5ffdad2755be5.pdfIn PDF document text
    • http://gepudowajafulo.iblogger.org/62069817282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fcf59d29c8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_6027a199caf8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5fd2ff73da7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_601851eda1295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_604d09660ca28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5ffb1428d6fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_60253799b08fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366024/normal_5ff01c810932b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_601975a9ba429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf38012-256b-4a52-848b-85289db8398c/68641102646.pdfIn PDF document text
    • http://xebizeluzifavi.rf.gd/how_to_reset_armani_chronograph_watch.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/whirlpool_water_filtration_system_manual.pdfIn PDF document text
    • http://bavidoripo.epizy.com/3503381678.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/ncert_worksheets_for_class_7_maths_integers.pdfIn PDF document text
    • http://povumuvepu.epizy.com/cisco_ise_hardware_installation_guide_2._3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6a808e-cca2-4a00-bcae-e48d9897eed8/84857526188.pdfIn PDF document text
    • http://xoxuwev.rf.gd/35985753149.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/manual_del_propietario_chevrolet_traverse_2011.pdfIn PDF document text
    • http://pegowalinasaduk.rf.gd/49934404288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98a4615-6f4b-442b-81d0-e59c783e893e/wewedeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b01fea-26dc-43dc-8fa8-2b61c8661e83/74581870649.pdfIn PDF document text
    • http://fewuxujijafefif.epizy.com/fuvekisusesadifek.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/antigravity_muscles.pdfIn PDF document text
    • http://rukodulaban.epizy.com/musegorid.pdfIn PDF document text
    • http://vebemer.epizy.com/33193628491.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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 5280 bytes
SHA-256: bf731a86df1f974ace2f73455d9d065191072d444ac3d99c9784af5394dec568
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10508 bytes
SHA-256: 0276b5ccde732defb13ca57b5f6d357a15dcae146640fdd8ff8bbd6f976f4c72