Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f791723e68294b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 12:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5cbb54b7d9a8df25dc6083934c5a707 SHA-1: b5f2178a29a486e9f8ba0ce33b7fb2b2358ea8a3 SHA-256: a3f791723e68294bde31c17036e0193b75b84491a97bb52c01369b24558022f3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/wix?keyword=endangered+species+project+pdf PDF link annotation
    • http://lifelalulenomip.mygamesonline.org/balance_scorecard_adalah.pdfIn PDF document text
    • http://dofoten.22web.org/what_does_30_for_30_mean_forbes.pdfIn PDF document text
    • http://itravelgr.com/what_size_hot_dawg_heater_do_i_need_for_my_garage5lgqe.pdfIn PDF document text
    • http://shothard.site/zupoxexiki3tvcm.pdfIn PDF document text
    • http://albatros-trans.ru/jabemaxuxojujivobeudhw.pdfIn PDF document text
    • http://puwonasomoso.22web.org/aperturas_de_ajedrez_libro.pdfIn PDF document text
    • http://1xbets-reg.site/eastern_cooperative_oncology_group_performance_status_scaleyj61v.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/91504227906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_fe2538b349d84d718b8963032f8300b5.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_3e80ef15ce0b4998b42b1af4979a302b.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_d21f9bbbc03a4b329fe042b9779acbe8.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_179dfb6aa7c540a3915377152f625f12.pdf?index=trueIn PDF document text
    • http://milasumumalun.epizy.com/xubilasev.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_c33e184c25a64993a2f2566602952c02.pdf?index=trueIn PDF document text
    • http://fetalinato.epizy.com/plural_form_of_regular_nouns_worksheets.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_7f3c8d8f1aea4f18ade53787ee98322d.pdf?index=trueIn PDF document text
    • http://vitusaw.rf.gd/christmas_hymns_sheet_music.pdfIn PDF document text
    • http://zuburojirep.epizy.com/carry_on_rainbow_rowell_book_review.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_e4f26b0467a147b0b8cfbecf4fa45575.pdf?index=trueIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_51bd3c01c86e4c5c8b6a58f259004f07.pdf?index=trueIn 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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 5324 bytes
SHA-256: c03ec741440fdbba7314320976446f4e47e1c3dec1a7b1d3c29a7f2e7977cb7d
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10136 bytes
SHA-256: c4ecab528dee5569c32a066c8e162d985d4b440f701cbe00e277a67944707620