Malicious PDF — malware analysis report

Static analysis result for SHA-256 471b9fa9571542d2…

MALICIOUS

PDF

101.6 KB Created: 2020-12-11 03:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b0add1b62cf6996d1074c3e8c18e3d57 SHA-1: db84919d0a5a9cf692ad810cb74a5b5b22106209 SHA-256: 471b9fa9571542d2d27aa36bffc0dcc67649e80689f4b288a28b353ea35f56d8
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=what+year+did+charles+frederick+ingalls+die In PDF document text
    • https://bamaxasujobuz.weebly.com/uploads/1/3/4/3/134315865/telula-baxivikivut-nexujajuvujix.pdfIn PDF document text
    • https://muwubuzegutan.weebly.com/uploads/1/3/4/6/134649477/3c319a3a44bf0de.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/tikivagafidunexif.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/defawaxomidatem-nesiwa.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/fojutowubiwap-zabedijid-fuxosudujonesif.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/4059576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f01c31-c6cf-42f1-8a44-994563473f03/portfolio_projects_for_business_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/gazeziximo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/partnership_agreement_document_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe7eabc-6bbd-444e-a1e5-dcaf4e249c04/63294549148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3c9a2d-8317-4cb8-9aa2-d97bb40ac324/vewebakigunupoluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbf738d-0641-4800-9ab0-d10c2351d58d/morgan_stanley_investment_banking_summer_internship_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/damawu.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/bose_soundlink_3_price.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/23284307027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2a74ea-dc60-4506-a74b-a622e79caa80/20684138282.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 5460 bytes
SHA-256: ea8b3c2ba39a7f33c9b27b4ebc193751cef54ca0325ca758f8bba50fe86bd9c9
font_01_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 3772 bytes
SHA-256: 9389eabb5da0f7ff5893e499ff791b47d46466a46589dcf6e6727fbd9e34bd63
font_02_sfnt_off0001417f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417F 12160 bytes
SHA-256: 2a8252281d79dd28b342ef0cc83a3ae6c96fffe8692817b9d931f9b8094275a8
font_03_sfnt_off000168fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FC 9660 bytes
SHA-256: a905565585a7be98ec7754fb8ddc2454eb41027c988090af1115c4fcbe073e57