Malicious PDF — malware analysis report

Static analysis result for SHA-256 b425b76bded2feda…

MALICIOUS

PDF

81.8 KB Created: 2021-03-21 12:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0fc77d71ada1c710aed7e612074e3b4 SHA-1: 706abf08606ca33af2bdcc63137efe50e614826c SHA-256: b425b76bded2feda83e87d49196ca8641a03d19331ec1e3ed2d815298cb4c658
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 0.9998

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://nipisod.ru/award?keyword=esfera+biopsicosocial+pdf PDF link annotation
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/nerimave_lanefiruvakam_vipesunedidegu_wuzorafixizewo.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/what_can_a_kindle_fire_10_do.pdfIn PDF document text
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/kefepisezog-wilolo-kovesuw-xivefonad.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/2c98fd37071.pdfIn PDF document text
    • http://poradoit2.site/signos_del_teatro_sonidov4qor.pdfIn PDF document text
    • http://wordwild-store.com/jufesejewomazobulfkqd.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/xizarivir.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/ar_equivalent_to_lexile4rldn.pdfIn PDF document text
    • http://hookup753.fun/numabulilebajelesuinqwb.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/maxipuredepo.pdfIn PDF document text
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/4e146105.pdfIn PDF document text
    • http://leomannapov.com/power_book_ii_ghost_episode_5wy9kc.pdfIn PDF document text
    • https://vaferevipesefur.weebly.com/uploads/1/3/0/9/130969420/75f876404e870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_fd5183722b8a436c91736033ae8c03b1.pdf?index=trueIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_15732f8e03bb401c9cde15fe9b792bc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/1959_cessna_172_service_manual.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/dictamen_ley_de_austeridad_republicana.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/zivukifosiz.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/51583178274.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/chocolate_warehouse_sale_philippines.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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 5244 bytes
SHA-256: 1ff0cf8055af9cf630969761ff4e65a4a9d1dc3af348d630aad2f24955842043
font_01_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 12804 bytes
SHA-256: 6ce9b0a360f995f1d9170da5ac0f2361357699cb82e67fc47f86b7d7930dcfc8

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