Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fb9aec6b060f8a…

MALICIOUS

PDF

70.3 KB Created: 2021-03-22 09:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a6f41dfae65dff010b910fae701ecd0d SHA-1: eda5ec4f751007d8720dce54ec3fbf72be2392f4 SHA-256: 67fb9aec6b060f8aa74e77ffd1e1e2408c4c60cdf76e2c8c5aa4d2ad68c84367
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=area+and+perimeter+of+compound+shapes+worksheets+pdf PDF link annotation
    • http://lukufogud.getenjoyment.net/94733322061.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/208601160012fjk4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5fdc526aee9d8.pdfIn PDF document text
    • http://allroadkamchatka.ru/suzuki_violin_school_volume_1acorm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_602251da815c1.pdfIn PDF document text
    • https://gozowejikagigu.weebly.com/uploads/1/3/5/3/135345496/bosedamikokagotukav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ffe531705524.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/1908350029.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/fracaso_escolar_en_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_60242ae4d4781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fce242a7f7de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_601b902694137.pdfIn PDF document text
    • http://lunesygets.xyz/what_is_the_main_purpose_of_the_invisible_primarysjnfo.pdfIn PDF document text
    • http://org-fruit.space/blank_staff_paper_sheetswr7db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5fcae65759d4b.pdfIn PDF document text
    • http://cybety.xyz/how_much_hp_can_a_stock_2010_camaro_ss_handlegsu3o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5feffcc0c0469.pdfIn PDF document text
    • https://wumezovavupod.weebly.com/uploads/1/3/4/7/134741594/janasazavetexakibu.pdfIn PDF document text
    • https://peretokat.weebly.com/uploads/1/3/4/0/134040551/8485341.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/sugowubuf/business_plan_startup_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/how_to_level_up_fast_eso_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/apodartho_fossils_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/why_do_trains_go_back_and_forth.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/romance_of_the_three_kingdoms_book_english.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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 5508 bytes
SHA-256: bf861294d27a7bd1da07c2cd8bda675309e1be4c06e6d54f6f4c668f0955e507
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 9988 bytes
SHA-256: ec898e78c41f5b1a4ab52324b979733be1f955554029b4cee8a5397e75941aad