Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1fbb8e25bc1dac…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 21:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c62fcff8344053863fe375754ae7bb33 SHA-1: 771ac171f9909f728b569f11f8a69500f0217d20 SHA-256: ea1fbb8e25bc1dac17e8e124b8c47e3cd4228e238f8273de48d420b60eddbfb1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

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://midufefew.ru/award?keyword=assessment+tools+for+preschool+pdf PDF link annotation
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/vajurotudovav_dadetanak_tuloxaguwebima_lexobubufoteli.pdfIn PDF document text
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/7764913.pdfIn PDF document text
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/vekakagonuvoriruvule.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/snsif55/voxaditeretinalinon.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/12861203137.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/54284323146.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/66970105846.pdfIn PDF document text
    • http://manovina.mypressonline.com/2008_honda_civic_si_coupe_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/gfiijf5/wwe_raw_results_today_sportskeeda.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/xYidmhg/84741929647.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/gieggjh/car_running_cold_start_noise.pdfIn PDF document text
    • https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/36c59de08e87.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/igujapt/statutory_form_warranty_deed.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/fusionner_2_en_1_en_ligne.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jiebHhc/43961133106.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/jfNgihh/940265841.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/ff8b6011-1d10-4d54-a8d3-a02364581bd4/bonasobidokuxijusinadixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe2f914-2452-4b38-9348-48d89397781c/78947326163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7205c876-19ad-4dcc-8195-396a2d65de9a/42311638352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e98b5c-2b6d-45f9-9417-27ef32b16b84/17641111915.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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 5172 bytes
SHA-256: 958aace68b622db133e6fea596f4466d4cc1b727740a4afbd7e65022334ea5ea
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10812 bytes
SHA-256: 0115a1d295015253f45defe044b109d5b2a7405f3b9c444ecf705670c8ec614f