Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb577cedd4b8f420…

MALICIOUS

PDF

120.6 KB Created: 2021-06-07 13:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0ba34c5a3e4fa898834fec1e8bc75ce7 SHA-1: 11fdc930853a76da0001c2bd185bdef5ef1a9722 SHA-256: eb577cedd4b8f420374d84f1e2a06ed1154520a86689039e639fd6b2cd6bf7be
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

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://pixomot.ru/pbw?utm_term=how+to+speak+basic+english+with+tamil+meaning PDF link annotation
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/bakusagepekori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5feaf524c02ce.pdfIn PDF document text
    • https://gisoxesasolide.weebly.com/uploads/1/3/4/5/134590405/7140539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_6041d03d7b843.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/nareriwoponibet.pdfIn PDF document text
    • https://foxegakadop.weebly.com/uploads/1/3/4/3/134337736/94aeae.pdfIn PDF document text
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/4215363.pdfIn PDF document text
    • https://wifirinopemuv.weebly.com/uploads/1/3/4/7/134762260/zixojituja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_6051c5e51a62e.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/5569760.pdfIn PDF document text
    • https://soxotinimom.weebly.com/uploads/1/3/4/8/134883838/6b274931.pdfIn PDF document text
    • https://jipedopifuxo.weebly.com/uploads/1/3/4/0/134042804/pijokom_digabijiman_weraf_rasemolager.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nigezid.pbworks.com/f/interpreting_double_bar_graphs_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11afc73-6f82-436b-891f-18e81af26cbd/19837152699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a6e4d9-d3be-49ae-9eb8-cfc28f437673/oasis_bottled_water_cooler_parts.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/how_to_recover_photos_from_google_drive_trash.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144473586/6760142494.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/captain_tsubasa_ps4_price.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/sniper_ultimate_kill_full_hd_movie_download_in_hindi.pdfIn PDF document text
    • http://kegogaxevu.pbworks.com/f/my_talking_tom_2_mod_apk_hack_unlimited_money_and_stars.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/how_to_adjust_husqvarna_zero_turn_steering.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00017a55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17A55 27812 bytes
SHA-256: 78d11182a7fccbeefee74c1a6f69c86594ae14c5547a88d7b77dc7019cb0e128
font_00_sfnt_off000167b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B1 5508 bytes
SHA-256: f5631e358a29dfbf322906f79d9482f156c55cadcb084f570217d9eae492fc0f
font_02_sfnt_off0001b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B208 10248 bytes
SHA-256: 0e212953b5cbe36d4795ace5de8106c1e16a6fd9dcc4f367c7082f65255ac27e