Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee882e1125b509f9…

MALICIOUS

PDF

75.4 KB Created: 2021-03-21 10:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4630431880056784f88943237b0cc949 SHA-1: dff3d6ef837cc6e210d9734ecf6ec35826987081 SHA-256: ee882e1125b509f926a3cbd1353d83cf969b06dde69189164e1f1be25c8893fe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic for a PDF link farm point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=physics+volume+2+david+halliday+pdf
    • https://poxozebirineba.weebly.com/uploads/1/3/4/4/134447173/tajuniwavebuxos.pdf
    • https://cdn.sqhk.co/sitopizol/hgNhg4r/nufunuwoxatag.pdf
    • https://cdn.sqhk.co/pabonoruje/7ibTiiZ/granite_laminate_countertop_sheets.pdf
    • https://cdn.sqhk.co/sajatanugeg/hhhhxgd/70032124122.pdf
    • https://cdn.sqhk.co/neratimo/jjPgcvl/35824715137.pdf
    • http://medazuxa.mywebcommunity.org/cosco_high_chair_how_to_fold.pdf
    • http://judupebe.getenjoyment.net/58982526928.pdf
    • http://lojapidabud.mypressonline.com/lokavuvusugamikimufew.pdf
    • https://nedilobimizedov.weebly.com/uploads/1/3/5/3/135346130/169fa1d2.pdf
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/b77103db.pdf
    • http://tamogulaganero.scienceontheweb.net/30572797066.pdf
    • https://gufovijer.weebly.com/uploads/1/3/5/3/135339237/5870631.pdf
    • https://cdn.sqhk.co/wujugojuse/FLodlgc/kunodaxabaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusori/mixafivuvej.pdf
    • https://s3.amazonaws.com/mefadedosuw/bigger_faster_stronger_workout_routine.pdf
    • https://uploads.strikinglycdn.com/files/e470b9fc-1165-4e2e-9cad-7b128dd962bd/tujuwavozoxawimutezitosud.pdf
    • https://uploads.strikinglycdn.com/files/76384cd3-67a6-4649-9533-3f506dec6687/pifolefizenaperajinire.pdf
    • https://s3.amazonaws.com/mufukep/cisco_ssl_vpn_configuration_guide_asa.pdf
    • https://uploads.strikinglycdn.com/files/e29915e7-bf79-42b4-a2a0-548bd7671257/dir-615_c1_dd-wrt.pdf
    • https://uploads.strikinglycdn.com/files/8cd39264-44e5-4c31-a8cf-571cc60bdfa3/najisewidezapujuxurebeg.pdf
    • https://s3.amazonaws.com/xugigabitulu/12366448169.pdf
    • http://wipadafefuxasi.onlinewebshop.net/how_to_win_the_pick_3_lottery_strategy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5be.bin
cd7c50392acaf7911ac8fafc90ed41162add3bdb58651795c3671ca6046f548b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 5596 bytes
font_01_sfnt_off0000f8b8.bin
1195563a096ecc14c776fd2594ff7a2330bd1675c27408676bbd622b5300b637		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 12020 bytes

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