Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ff4f88682d0925…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 20:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9dc249bb1f58c0430e1bfd9ea36ddc92 SHA-1: 5a83066e22183df0b7efe53305e1f1de4a1be4cc SHA-256: a1ff4f88682d0925da5f20ea60c57a702d448c3c813b4db8c14b071a51f1cb7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=dawn+apgar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464851/normal_603257d0ca40b.pdfIn PDF document text
    • http://kagoxugukata.22web.org/labor_day_worksheets_for_1st_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/fvCwb6H/94278431308.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hehfigj/fituwixatam.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/gjJEsjf/10696141118.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/hgigeOQ/zombie_fighter_virtual_reality_headset.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/Ljiiige/37166833957.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/jujetn1/54363223336.pdfIn PDF document text
    • http://wetikufuwigiwox.iblogger.org/73737233438.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/h2o_mop_x5_manual_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fdb27334b1ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_603688c601461.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/gigJfCB/38602936475.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/zhenctL/bakimonagugodaki.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/wahl_detail_trimmer_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_602f002cbfaf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baguzakanaso.epizy.com/bubazulukipuz.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/rasegofagafojitisonorizuf.pdfIn PDF document text
    • http://vorawaforase.epizy.com/jaluwerekazu.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/50775272827.pdfIn PDF document text
    • http://mowovojedux.epizy.com/benijitesakigevir.pdfIn PDF document text
    • http://fabevax.myartsonline.com/northstar_building_skills_for_the_toefl_ibt_intermediate.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5088 bytes
SHA-256: 06bd04e5ae1f066d088d13025106788fe61df1c0224ab3215d0324017279c8cb
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 11496 bytes
SHA-256: 27cfdf9cc4baaca687ea25898f907e1f5b2123ab5e2d0ea54ea2f7ff8b8eb738

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