Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d37528180213fc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-03 22:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da7d6fd396ea94aeecb60d82f7699151 SHA-1: 9ce4300d039ede1523ed6b9d71c846f504f9a938 SHA-256: e8d37528180213fcd11de3d00fe2360f4c9b0942ad62318c0f84f730cc0ac727
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 0.9996

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://jottigo.ru/123?utm_term=play+the+monkees+theme+song PDF link annotation
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/f09b9048.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/kenwood_kdc_138_wiring.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/6ed9fb0206.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/4vcQFjg/47045952967.pdfIn PDF document text
    • https://kofodurulivikaf.weebly.com/uploads/1/3/3/9/133997487/1712529.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/dilesujabe.pdfIn PDF document text
    • https://vojoritus.weebly.com/uploads/1/3/1/1/131164067/6884752.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/is_cyberpunk_out_yet.pdfIn PDF document text
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/rifezawobekanode.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/h6Hicif/pudovofanadupusigob.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/7479783.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/durejufarotatumo.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/3802079.pdfIn PDF document text
    • https://fuzaterolipi.weebly.com/uploads/1/3/1/4/131438829/vajaruwipozevapov.pdfIn PDF document text
    • https://kakifimetuwojo.weebly.com/uploads/1/3/4/3/134317364/labisofog.pdfIn PDF document text
    • https://dosolixegu.weebly.com/uploads/1/3/4/3/134340741/c01d6e933.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/kezezesetawujiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tutasujal/la_iliada_caracteristicas_de_los_personajes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/compare_and_contrast_worksheets_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/galuvedidutilomolilakov.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/transport_canada_boater_exam_answers.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_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5172 bytes
SHA-256: 28a91540862ae68f5553c49df355ef5f62be972090c9cdefd4102a23b9b54f62
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 10408 bytes
SHA-256: 321a2fd71beb8082a09845f021314c8fcf2d62934182cd438ef4d9ca069c112b

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