Malicious PDF — malware analysis report

Static analysis result for SHA-256 329bd505cc80df52…

MALICIOUS

PDF

101.3 KB Created: 2021-05-26 15:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b017b529704a513329882984b3805fa8 SHA-1: 58ddf2dcbf658664950654b22b8d1c1fbdbef280 SHA-256: 329bd505cc80df52849e5ae6531d09a2ec36f6569cbd43f14426f64c1fddd10a
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 0.9997

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://xajibur.ru/strik?utm_term=zoo+ou+l%2527assassin+philanthrope+pdf+gratuit PDF link annotation
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/b8020e6b07ab.pdfIn PDF document text
    • https://muboxofibadufus.weebly.com/uploads/1/3/4/3/134310828/3804072.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/potofije-mutanowit-biwinasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde3fcd611e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fcae894a7cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_605266d9cc2ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_60074b2b57411.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/losubisalogenozu.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/816051.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/muzefajumu.pdfIn PDF document text
    • https://zegazofegu.weebly.com/uploads/1/3/5/2/135296009/9814918.pdfIn PDF document text
    • https://kosonijuzar.weebly.com/uploads/1/3/5/9/135974682/virixedixivun_bubifepezonoku_xapidugusija_mupifaxudes.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/gadatubobibewav_mukewuvaz_luledomujurilan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496811/normal_604e872cd23a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_604ed7dc4b104.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/3265721.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/1631725.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/7b3ebd79-5538-4fe9-879a-bed5cc5a2646/letter_from_birmingham_jail_goal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c4362c-1f49-470d-9134-b35029eb110e/the_five_faces_of_oppression_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d858df0-fd59-4753-b3aa-a75aa19c4ed8/kurudonuzexoba.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 5296 bytes
SHA-256: 073dcbd04bed9fd3aa5d544672a4972db424f6068080d508088f4921a1d2c516
font_01_sfnt_off000142ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CA 14616 bytes
SHA-256: ff48edd7b49e41cd64768f341875509977b0ccfea9232f25bd39f7f7f556c0ad
font_02_sfnt_off0001708b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708B 16172 bytes
SHA-256: d6b22a3af5de17498c24f972fbc9500047da5cf9ea19c32be09581fc76eaa380