Malicious PDF — malware analysis report

Static analysis result for SHA-256 087081cdbddd31b5…

MALICIOUS

PDF

79.9 KB Created: 2021-05-09 19:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7400f2fd3537fe4dc4f8500822cf180a SHA-1: 294162b46ae027244e857bb425c866b5fcaa71dd SHA-256: 087081cdbddd31b5d4bbd9c99af238d01f8e5963ddf2bae2bab80b4dffe13f03
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The presence of a 'utm_term' parameter in one of the URLs points towards tracking user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=should+you+jump+rope+on+concrete PDF link annotation
    • https://cdn.sqhk.co/lepapina/gggjgeX/10423574640.pdfIn PDF document text
    • https://jidegumot.weebly.com/uploads/1/3/0/7/130776526/sobebexuvufexat-jisapariwulak-reber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_6037910fa3188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_603521b095512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_6058b4c48ad84.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/kN06xhb/memasemekawugeduribekevo.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/eRouife/32176342931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_60625b902dc1e.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/water_and_wastewater_engineering_mackenzie_davis_solutions.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/resumen_de_el_libro_de_los_muertos_egipcio.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ijKjdgj/arcade_dragon_blaze.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/free_bicycle_repair_manual.pdfIn PDF document text
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/mivujuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/cY4ijhh/free_robux_roblox_promo_codes_may_2020.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/eos_rebel_t5_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6012e06313e4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_254e91b3f8c84af0918c10e2c7691f0c.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_299c80401fe34f2b970895e298c47704.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_ab515df9973d4f93ac87419ec4392e86.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_eae9d4204aa04caca50ab18d1e1e815f.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_ece367dd2b854b738f289bbbc73c67e5.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_2952e69cee1e416caf4fed31b658fc0b.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_3a890035af5c44eab7d3c79f8dd06d65.pdf?index=trueIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_d9e703f042ae4cceace3f852d9302752.pdf?index=trueIn PDF document text
    • http://jufogitomob.onlinewebshop.net/new_hotel_architecture_and_design.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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5204 bytes
SHA-256: 83b8dc9d34752db2e38eb4210f820ef8f0b781615533ecca0a7aa54cfacb00ff
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 10696 bytes
SHA-256: c559b6853357ef3cfe269bbcd789dc424196c98621d9ed3f7c026eccb4e84866