Malicious PDF — malware analysis report

Static analysis result for SHA-256 e943dd2077c0bcc8…

MALICIOUS

PDF

85.7 KB Created: 2021-04-03 18:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 991ebb52a5156ee3901edc4c4f5d0094 SHA-1: 1439809ff4dd135660bf512e54b65ee2774df59a SHA-256: e943dd2077c0bcc8d1640931b68d57e7bd4d4bc507a1751cbe25ac126b8391f3
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 0.9993

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://kuzutuzo.ru/123?utm_term=jj+benitez+caballo+de+troya+8+pdf PDF link annotation
    • http://reactivaperu-2020.com/promethean_activboard_price_in_indiagpb3r.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/rilatewovimuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_5fd8a0a4735f0.pdfIn PDF document text
    • https://gopaxeseje.weebly.com/uploads/1/3/6/0/136082610/dupobipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5fd8be9219169.pdfIn PDF document text
    • http://getfreecreditreport.info/90308557495uv2bz.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/mitetuvunejadaz_jugoviweziz_menikezofek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450883/normal_5ff15ec5ed1bf.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/zevizudizeworojod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_605d71cd62760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5fe0350914b04.pdfIn PDF document text
    • http://everydayy.fun/titebogokasojugolasasukef3w4l.pdfIn PDF document text
    • http://7gusevshop.website/sony_vegas_pro_13_tutorial_effects62ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_60272645abc88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5fed6545337e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5feb6b0e49556.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/vejekev_mabavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ad1aca-99cf-469a-abff-0201ca50f44c/how_to_adjust_carb_on_husqvarna_460_rancher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe679f9-1557-4d11-9be1-4e1888147676/samsung_washing_machine_repairs_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10009ed-d15e-4b2b-8c3f-517366badebd/how_to_make_excel_formulas_run_faster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c724f2-10b1-4371-916e-418f388ffa8c/lista_de_verbos_regulares_e_irregulares_en_ingls_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8618b8cf-779f-4352-879d-6d409888f2da/plc_fuzzy_logic_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0942725c-e355-45b2-ad7a-63e0c28c131e/27584071574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a059a86-a0df-4245-8076-05b5204e2ee7/wofifufaduzazurapuzatanav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76a8b00-92fd-4a4a-b978-20ddea98dcbf/vajuxaro.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_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 5524 bytes
SHA-256: bae9690dea5cc72f08b861d310ae535a55841ae21b021868c5363ab2da521abc
font_01_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 12180 bytes
SHA-256: b032cf7f84cb30beb24f7751b8fa1ac83ce55262cfe2bbc632c9682d1caea41f