Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3ffad9651004d2…

MALICIOUS

PDF

81.4 KB Created: 2021-03-31 23:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 88f1740fa6306af99d89a8b12807564d SHA-1: 533349d882cccf457c8aa317bad29ed12d32fbec SHA-256: 2a3ffad9651004d2df497b92d666da693d066acdfd0cad393713b6e832d9ee02
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=internal+audit+director+job+description+pdf PDF link annotation
    • http://enots.space/cours_anglais_debutant9zz9n.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/vemizupabusizuz.pdfIn PDF document text
    • http://kittyplay.online/hindi_letters_tracing_worksheets2g16g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fd6649b71dfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fee500959d4c.pdfIn PDF document text
    • http://lifeshop.pro/pijasubakuxugxr7rh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5ff2d5621ca3d.pdfIn PDF document text
    • http://gelivebun.22web.org/cambridge_igcse_chemistry_practical_workbook_answers.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/pubejipizofe_xuvedoriguzi_liwinavofiteme_lebukilokuw.pdfIn PDF document text
    • http://businesshelpservice.com/65622878482xvywz.pdfIn PDF document text
    • http://classkaod.ru/heat_transfer_equation_engineering_toolboxfel4e.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/camino_del_norte_etapas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_56f4e7692bfe40edb5bbf5c4d68838ce.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_f61d61c6b82644f3aae03bd2af913279.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5202015e-b344-4419-9b04-8852da3a31b5/divina_commedia_inferno_canto_33.pdfIn PDF document text
    • http://zokudubogot.epizy.com/las_purinas_y_pirimidinas_son.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_c1da58f52fb1449fb745897c302d5581.pdf?index=trueIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_b96c68a67b4e4d4a83cd5bf798276b42.pdf?index=trueIn PDF document text
    • http://zezoverirokumom.rf.gd/mantenimiento_de_centrales_hidroelectricas.pdfIn PDF document text
    • http://tirizalewofux.rf.gd/vixezige.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_e71e36bf7a554a2cb122f37fd46a1510.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fdca2f-790d-42ba-9464-3a2868a68f51/best_penny_stocks_to_buy_on_robinhood_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84b7886-94f8-4221-b922-82673041033c/can_ps3_move_controller_work_on_ps4_vr.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
font_00_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 5184 bytes
SHA-256: f7bdbacf9647b81d5c1f38dd5ab3677541c32d210d96183bdfc96f9918aaf0cd
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 10364 bytes
SHA-256: f8e671d4a6d11733b3bdefb887d00e201acfc6d0a8366025494fc70259113b98
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333