Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc41f3624a9845cf…

MALICIOUS

PDF

93.5 KB Created: 2021-02-19 14:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43ad5978ca975bc206952a6383cba40e SHA-1: d4a0d83ef9ad03ff21bc16529bbf35962ac26849 SHA-256: dc41f3624a9845cfd3c5b29452575242f18425f9ab4f257d0823dbf42bce7613
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, embedding numerous URLs that lead to external sites, some of which are hosted on disposable domains. This behavior is consistent with phishing or malware distribution campaigns, where users are directed to malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/123?utm_term=honeywell+k4392v2-h+change+battery PDF link annotation
    • http://copyrightnotices-form.com/retirement_withdrawal_calculator_excel_templateo7vd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_602b87091480d.pdfIn PDF document text
    • http://fabulouss.space/ryobi_bt3000_extension_tablerlu0a.pdfIn PDF document text
    • http://useporte.xyz/the_equalizer_2_rating_parents_guidepxmub.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/8708352.pdfIn PDF document text
    • http://podarokinsta.online/gumagerapalamuxutevauwcl8.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/eiDKtoN/35646767510.pdfIn PDF document text
    • http://upsbox.ru/35581448515wyl6r.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/oHgcjjh/pay_verizon_business_account.pdfIn PDF document text
    • http://petrol-v-pol-price.site/cateye_astrale_8_manual_espaolf6obj.pdfIn PDF document text
    • https://remenogabeta.weebly.com/uploads/1/3/4/0/134012297/bewuv.pdfIn PDF document text
    • http://avit0.cc/506772250475s37t.pdfIn PDF document text
    • http://busivel.xyz/how_often_does_a_2014_toyota_camry_need_an_oil_changesi2yb.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/favodejitisopo_zudupaxagom_dunala_gezumu.pdfIn PDF document text
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/206c51.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/aGhNVhj/red_green_and_blue_makes_what_color.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/chhmjfO/liwew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424347/normal_5fe4fcbb21bab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5ff9ea2e9fa9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_5fe87c35e2954.pdfIn PDF document text
    • http://lalat.space/tuxiwegevajpccq0.pdfIn PDF document text
    • http://kinoxca.xyz/informational_influence_definition_psychologyr06yq.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/hegdUFG/ziwutefinagikafedamijijox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 5876 bytes
SHA-256: 26e88cdd712c78b384567a95b0e4af27cad988ef1ddaeeba12a90943352d716c
font_01_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 11540 bytes
SHA-256: b5820fec84644f43622ed99407308075895a08af2ac5e311051d5ed9fed0d55b
font_02_sfnt_off00014fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB4 16536 bytes
SHA-256: 7ea8daa4dd463885d07651213cb7e339c26f67b4ab44effa920c77048ec3de4f