Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b86d2a7fca42358…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 06:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cfca55649288fc6116b20ae96d53568a SHA-1: 85bb20d15434aa5fb4ef27d9df119034b875b5c5 SHA-256: 0b86d2a7fca42358f1050df31f3165ced68b7cf7b270924cb2b87064da53e790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9990

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=metodologia+de+la+investigacion+juridica+unid PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/7f1dea56e15.pdfIn PDF document text
    • http://klokisik.space/act_bubble_sheet_2020kglha.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/bXgeHid/44559036866.pdfIn PDF document text
    • http://3203epworthcres.com/how_to_find_a_picture_of_a_house_by_address55odd.pdfIn PDF document text
    • http://zukoxofiro.22web.org/past_simple_past_continuous_present_perfect_exercises_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/Ljadgjc/cycle_wheel_size_guide.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/nejekavatotakagubolob.pdfIn PDF document text
    • https://kajimawujejava.weebly.com/uploads/1/3/5/3/135348493/xelipupikuxegoro.pdfIn PDF document text
    • http://xxlmature.site/kodipedidosadewavuropexyrogn.pdfIn PDF document text
    • https://cdn.sqhk.co/tigugobe/jd40jbJ/basketball_stars_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/nhbhbBn/41772188007.pdfIn PDF document text
    • http://menformula.xyz/recognize_the_common_purposes_for_writing93p74.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/ggBjcpi/xakanabimijudimamexana.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/69621172586.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/32988552036.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/10249868463.pdfIn PDF document text
    • https://tefuxaforubexo.weebly.com/uploads/1/3/4/4/134446539/ledenovakumaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_4c0cac81d7104074a3f61172e97cd10e.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_91b82cc742e44348adaa9ee0967eba1d.pdf?index=trueIn PDF document text
    • http://daluzijirajof.rf.gd/proyecto_de_investigacion_accion_seminario_ejemplo.pdfIn PDF document text
    • http://gobiburitumeri.epizy.com/google_assistant_apk_android_4._1._2.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_37eca6b6833b4998b3c843cc51fb6e8c.pdf?index=trueIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_ac1290c90480440cb1cb3f02a2e1fbf5.pdf?index=trueIn PDF document text
    • http://zodiripek.myartsonline.com/fujuzox.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_eb03b4ceccf24b5cb18d09f801c1aed4.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5248 bytes
SHA-256: 4d51b618f0b5eb726cbc05e04c5acd8e97f94ad6f0bac225230d36e2b0a4a1ca
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 11892 bytes
SHA-256: 126d542d343ed51a6e79e7fc9ebbd3f780bf4b56fb0339d73c6a0ac9103fef97