Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41ebcccfa164815…

MALICIOUS

PDF

74.9 KB Created: 2021-01-19 01:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c8aa422c223d6f18583b6ba67c73fdf SHA-1: 2e12b2cd76f69894cf410fa043069af2aebc4ced SHA-256: c41ebcccfa164815c7f6493917be97706241d4f35846655cb9fdf336eb6762e8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

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 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.
  • 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://trafftec.ru/123?utm_term=what+is+hdmi+link+assurance PDF link annotation
    • https://cdn.sqhk.co/boketumejipa/i3ibGjg/36401021110.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/ceifcjg/10703843154.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/2xrpAAz/32117701418.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/fvhduVI/20011861216.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/f1QnieN/55789746887.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/HjbjcX3/top_100_nursery_rhymes_list.pdfIn PDF document text
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/naxojula.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/gfUhfak/dirt_trapping_rugs_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/gEidEF0/62476769152.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/xieHjfJ/what_baby_animal_are_you_quiz_playbuzz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_6006152b2abbc.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/kolabarerawogilomiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f88b5ae4f7d0.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/cigvhbi/flight_attendant_school_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/vDM4ib6/wotubineridad.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/dafiwulir.pdfIn PDF document text
    • https://ruruzepekasoto.weebly.com/uploads/1/3/4/7/134753799/mimalaxolosowew_vuvarojizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5fcf9c7d07fb0.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/aijiafp/genozejekanore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 5256 bytes
SHA-256: 75100376cf27654f9c97fcd39a5f7e628b774b1a31d8ac90a1e087fb7743e8d8
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 1760 bytes
SHA-256: 658a8f3ee3302ee2115b275549977f604d2682c5b40954e2bd5af249e8aba805
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 12636 bytes
SHA-256: 4790f293a7e853cc3e059db6f184bc6a71f1fdffd2accef912072d8f44c566fd

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