Malicious PDF — malware analysis report

Static analysis result for SHA-256 06057bcc79cc8b77…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 04:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4b716d55c776fe07bb11c874eb133083 SHA-1: c36f29ce154418013c95c8c7b09b25643c0d2192 SHA-256: 06057bcc79cc8b7752359c74c138888be8e95aa5d8dc80cf75c90b68844fcbf7
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 0.9990

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://resalured.ru/award?keyword=circular+linked+list+in+c+pdf PDF link annotation
    • https://cdn.sqhk.co/fosulavale/gfF1rSj/repisezelomubivirojajegi.pdfIn PDF document text
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/tejuridapudar-lezugukipib-jazudi-varupotez.pdfIn PDF document text
    • https://figokafudifugi.weebly.com/uploads/1/3/1/3/131383964/1aed9d9d2.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/ibbYo2h/free_function_graph_maker_online.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/gjiiGdU/magic_kingdom_castle_hotel_price.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/chicken_business_plan_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/YijHUhb/89405875347.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/tifilojewokul-zoruwo-pibebiso-pajapopodotedu.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/4089085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabopusafat.epizy.com/5th_grade_math_minutes_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8c2650-460c-4fb4-8255-fd4bdf0023dd/queen_mab_speech_romeo_and_juliet_1996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf5c07a-9303-4ba7-b9be-18e59ccfb051/77343704018.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/28793326106.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/autocad_commands_list_2019.pdfIn PDF document text
    • http://jotowit.rf.gd/samsung_refrigerator_not_making_ice_after_reset.pdfIn PDF document text
    • http://minirulo.epizy.com/megikeluxenipab.pdfIn PDF document text
    • http://rozosijamuruxo.rf.gd/61848061566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a737b420-33cd-4bb0-935a-7332d3ff3d3f/mugisegifirufig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0aa0511-fbba-47cf-a3cf-f7991d8587bc/40937654313.pdfIn PDF document text
    • http://tajavuminona.atwebpages.com/resetting_cateye_bike_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9691ad21-d63f-4ebf-adb8-1225b87215c5/how_check_status_of_irs_refund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b4f92e-11a6-44db-ae65-94952ed06e02/acer_gaming_laptop_price_list_in_philippines.pdfIn PDF document text
    • http://mokitipo.rf.gd/94298471146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3c80ff-700f-4b64-a577-7144ce35e515/pidovetipawuzi.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/lupapaworedikegabux.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5120 bytes
SHA-256: ac216a5e3ca83c412af74983c048d5ccbbf628e5c72be38ae657568a1bda9586
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 11120 bytes
SHA-256: 75415b4264c0d299d244fed6285bee7c41f5eae848a19bac0fbe6aa98a9b397b