Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae41f8616c859547…

MALICIOUS

PDF

68.1 KB Created: 2021-03-28 07:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c82557bfb9cfdb625d62f1991e6c8d24 SHA-1: 599ede57a1afe6e43ada1d6d2da11248acd741a5 SHA-256: ae41f8616c859547287fb65905f456fd6ce46ee53ba9d77b2c7e2c53f64ab2e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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://seumenha.ru/123?utm_term=heather+grey+jersey+sheets PDF link annotation
    • http://kusufuxufatup.getenjoyment.net/79553922520.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/jeijuja/felijusesapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_602fa1ac2b143.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/Nhhjh93/noraxew.pdfIn PDF document text
    • http://pijojavoto.mygamesonline.org/simawilalanasobabuwuvi.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/nisejokoxupowidiwilurila.pdfIn PDF document text
    • http://verifedform.com/grey_worldwide_sea_sdn_bhd8kd9p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_602496fa82b55.pdfIn PDF document text
    • http://rutetasilatigo.iblogger.org/67323061050.pdfIn PDF document text
    • http://thesimplycompleteseries.com/39038037214yxvl0.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/f3Fiihi/datenevirodomupi.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/vVichb4/car_accident_cross_keys_road_nj.pdfIn PDF document text
    • http://mists.space/degogopovunonobir2qdgi.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/sexafagesinijawaribuf.pdfIn PDF document text
    • http://kulinarny.site/julibewisivog1ww60.pdfIn PDF document text
    • http://universe1.space/28972440897wb2q5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jenigaseze.epizy.com/jojapozuxedoreruxolewamub.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/employee_appointment_letter_format.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/dedoserugukixarusib.pdfIn PDF document text
    • http://linexiziretewoj.rf.gd/palasunuxasofuxaxi.pdfIn PDF document text
    • http://sobegomogi.rf.gd/pdf_evangelismo_personal.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/how_to_add_zoom_meeting_to_calendar.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_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 5052 bytes
SHA-256: 8d73860681823d043ff3cb4f1ab9430ceda1b99363d1b79a88fe7111332de454
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 9932 bytes
SHA-256: 449ff4757261e2811563f8b4ad83c689af005450ab699965b8d05d92e363edde

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