Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a6dd3181dc6c50…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 13:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c8bd8e8b25ed2e08037ebab5d2e91227 SHA-1: 5c86a249d803791b916dde41f30acca78b6e071f SHA-256: e9a6dd3181dc6c500004638980e2f212cbb9d6bf8e12da5c9bc6b5aeeb763a17
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one prominent external URI that appears to be part of a link farm designed to redirect users. The document body is heavily obfuscated but contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=what+type+of+kidney+disease+cause+high+blood+pressure PDF link annotation
    • http://oneitshop.info/nifojuleporegozajiloxx9h77.pdfIn PDF document text
    • http://meetcabinets.xyz/59321405693ndjj.pdfIn PDF document text
    • http://nasty666.space/photo_mechanic_5_serialmzpp3.pdfIn PDF document text
    • http://gufutaca1.xyz/414161228835ic9r.pdfIn PDF document text
    • http://datinge.site/nonviolent_communication_summary57v30.pdfIn PDF document text
    • http://help-business-media.com/daily_math_review_grade_4z68cy.pdfIn PDF document text
    • http://goossyy.online/palepujaligixodupiwedubod95t2i.pdfIn PDF document text
    • http://ita-bio.space/27730119207sehnv.pdfIn PDF document text
    • http://esportzmlevent.com/28007013263qfx4j.pdfIn PDF document text
    • http://pink-echo.club/analisis_vectorial_schaum_1ra_ediciownqox.pdfIn PDF document text
    • http://custits.space/topdog_underdog_scene_4_summaryri6ja.pdfIn PDF document text
    • http://parrrtner.xyz/45684820811amxf3.pdfIn PDF document text
    • http://wegansit.space/vusepelijujugigi8bhm6.pdfIn PDF document text
    • http://romeita.fun/idsa_hiv_treatment_guidelinesjmxne.pdfIn PDF document text
    • http://supermagazforsale1.xyz/bafepol7j3t.pdfIn PDF document text
    • http://leftoutclub.com/hemostasis_in_dentistryxmdwi.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/755749224197l6yf.pdfIn PDF document text
    • http://umdtheatre.ru/4370827649784hah.pdfIn PDF document text
    • http://apparentlyopt.com/what_is_inductive_analysis_in_qualitative_researcho0y0p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofolup.rf.gd/2017_amc_10b_problem_17.pdfIn PDF document text
    • http://girakes.rf.gd/find_exterior_angle_of_regular_polygon.pdfIn PDF document text
    • http://nifilovovi.rf.gd/duke_wallpaper_hd_for_mobile.pdfIn PDF document text
    • http://gaderadosunuse.rf.gd/dividabutuja.pdfIn PDF document text
    • http://gadudadu.rf.gd/xoxunemijopawixu.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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 5736 bytes
SHA-256: 2915b833f4e14a63c55df22261165a2eafe0eee38aa58090072e7621171db40d
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10136 bytes
SHA-256: b66dcd8a003c50cd3b330e6fcbf1fb309fbc7e43a1a7c97975dc1612937d9f91

Open this report in the interactive analyzer, or submit your own file for analysis.