Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d49846a6f75625…

MALICIOUS

PDF

85.2 KB Created: 2021-03-13 18:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5245f6fce0e501fa154568afc4d3e538 SHA-1: 725243fe42e48864ba6bfac1a2ffc5c789b0659c SHA-256: f6d49846a6f75625c1a9be7218c56c1e0a855fac535d50bfc8f02c40f43dfc95
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=agile+methodology+scrum+kanban PDF link annotation
    • http://nukowivoxom.iblogger.org/hollywood_movie_avatar_2009_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pusizewa/ieVjhav/sasiridaguramikedopa.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/ZbFWMgj/candy_crush_saga_online_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zenipijujate/iXib6ic/throne_chair_rental_los_angeles.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/gegugo.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/is_it_ok_to_drink_chrysanthemum_tea_everyday.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/xgckKUk/gacha_life_club_wallpaper_hd_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/5hd12jb/trending_videos_on_youtube_worldwide.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/ic1ggyZ/try_not_to_laugh_challenge_impossible_spongebob_clean.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/online_railway_reservation_form.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ehdWdhj/lunisomusedidoge.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/RYOVjhD/soxudukawovidefed.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/e7IjhSE/mens_hairstyles_long_bangs_short_sides.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_01ca67bed1714f329535a298e1e66065.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_09bd6aff19c84d69a663902211a97178.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_099a60faa56f419481fb211448dc2f6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/sap_abap_online_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/election_commission_of_india_voter_card.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/fipuxigelogasibiseb.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/vigafurerezubulokidiwagak.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/5339874143.pdfIn PDF document text
    • http://watekiz.rf.gd/business_development_planning_template.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_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 5648 bytes
SHA-256: 21cc7136f3731b303e810b9ffe4f894e1dce90c4ac554eea077691bfc3e19674
font_01_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 10824 bytes
SHA-256: f3d252ae8a65f89973921d3aa58bc6e0dcaab8d2e07474103c368b420a6bfdf8