Malicious PDF — malware analysis report

Static analysis result for SHA-256 518afa6a0c2fca29…

MALICIOUS

PDF

77.7 KB Created: 2021-03-01 02:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5f7eb7ef6a6881e0fa4d419975b5cc6b SHA-1: bbb97260e73721e915d57b44ca4ac4ad82a8e95e SHA-256: 518afa6a0c2fca29c485ab24b1735dbc716ba6c98ab62581dc256cdc8ec2402d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a suspicious domain 'mezovuduw.ru' that appears to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination or distribute multiple malicious links. No scripts were extracted, but the overall structure and embedded URLs suggest a phishing or malware distribution attempt.

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 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=how+to+get+out+of+jail+in+monopoly+uk PDF link annotation
    • http://leledup.mypressonline.com/tajep.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/96944205142.pdfIn PDF document text
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/fofeluxi-ziditimukabiz-xurukelu-zojovopuvebe.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/dowapag.pdfIn PDF document text
    • http://terugate.mypressonline.com/vojevonuloledozunulomazu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/QCghhcL/mawezuvibufu.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/kenwood_two_way_radio_programming_software_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/jgihbji/geometry_dash_2._2_release_date_ios.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/la_divina_comedia_quien_fue_el_autor.pdfIn PDF document text
    • http://sparzha.club/vixotutow4gf2r.pdfIn PDF document text
    • https://pukejuzim.weebly.com/uploads/1/3/4/4/134457080/mevamoxevo-zorix-wukewa-wugutakujit.pdfIn PDF document text
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/0ec2a20aac363a.pdfIn PDF document text
    • http://ek-arenda.ru/harry_potter_sound_free_downloaddnvxq.pdfIn PDF document text
    • http://votatiji.22web.org/how_much_do_disney_stars_get_paid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/jaxonov.pdfIn PDF document text
    • http://mazogatu.epizy.com/f._r._s_full_form.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/nietzsche_the_gay_science.pdfIn PDF document text
    • http://jezuboteseg.epizy.com/4211852966.pdfIn PDF document text
    • http://jodirexefakevub.rf.gd/57172281677.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_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5244 bytes
SHA-256: b769c6312879bbfe2821972f0d6c69a8bf3f3d82b18e0290a7e5c18e755c6cc9
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 11104 bytes
SHA-256: 98bf541cdda821c16142b2e1df296cf0c3acd3056d313314049f6374f1a5fa28

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