Malicious PDF — malware analysis report

Static analysis result for SHA-256 338b9da94837eaa5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 16:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7cf3996c2a2d73f78bd869037fbedd1 SHA-1: 778682a6659e6bb884eff613187a716abc08eb13 SHA-256: 338b9da94837eaa5d729385a741553e9d53c6de65905eda7ce4ece2ffefb9270
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=pillars+of+eternity+ps4+class+guide PDF link annotation
    • http://zofugam.iblogger.org/texas_trucking_school_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/7lK3jia/download_garena_authenticator_for_pc_windows_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/iiZhcid/rush_rally_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/iejcieJ/52879835603.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/ghghyUr/xibavarelab.pdfIn PDF document text
    • https://cdn.sqhk.co/waxusuxagaki/uSjjmjb/block_craft_3d_download_free_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/brjjHsY/tamozidato.pdfIn PDF document text
    • http://daxuzas.22web.org/pijabaluwivunepowijovina.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/eRliej7/epson_iprint_pour_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/gmjagjh/mycbseguide_class_9_social_science_ncert_solutions.pdfIn PDF document text
    • http://fapenas.22web.org/excel_worksheet_greyed_out.pdfIn PDF document text
    • http://doporujela.iblogger.org/topadeberupogunibebajowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tumasun/59164775699.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/sutubigilatetivovorugelo.pdfIn PDF document text
    • http://femisudave.rf.gd/kitujil.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/43486409524.pdfIn PDF document text
    • http://rigirulame.epizy.com/mipef.pdfIn PDF document text
    • http://jegajumofi.rf.gd/pevirutesotuwisalisilegel.pdfIn PDF document text
    • http://teredibake.rf.gd/97805145921.pdfIn PDF document text
    • http://wekapalipewux.epizy.com/selanupurotokudutibodisug.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/5v_zener_diode_datasheet.pdfIn PDF document text
    • http://dodujis.epizy.com/saxon_math_course_2_free_download.pdfIn PDF document text
    • http://muwaziri.epizy.com/20202039925.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/jonero.pdfIn PDF document text
    • http://roxeruteruda.epizy.com/bengali_movie_belaseshe.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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 5512 bytes
SHA-256: 40a9a2ca071a726c057f8a1b64bd61463aaf18bc8243322f6142ec273ebf1fa1
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 10460 bytes
SHA-256: 602197b41d658dd66b8ad62de9262a75f87d3557a11a82cd36789ba42944abd0

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