Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7367d209928b1b7…

MALICIOUS

PDF

71.0 KB Created: 2021-02-22 01:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c78ee8e16e12573400bd11dbe35214df SHA-1: a6c96107c36b2eae0b8c260c467dad3733bc7401 SHA-256: a7367d209928b1b75056c99d4f42e2d40c4bebb9d9faa44dd11be5181ab14284
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/wb?keyword=is%20the%20night%20before%20christmas%20a%20poem PDF link annotation
    • http://velesvoyage.ru/926310193564oslf.pdfIn PDF document text
    • http://worldhold.online/microwave_recipes_indian_vegetarian_snacksovc6p.pdfIn PDF document text
    • http://changely.club/lexivijonujapuselinebagejlnvo.pdfIn PDF document text
    • http://metinozub.iblogger.org/29898869510.pdfIn PDF document text
    • http://youralteragoods.com/able_checklist_template_wordd74l8.pdfIn PDF document text
    • http://zumbayuliya.online/bulutibes916xe.pdfIn PDF document text
    • http://oneshops.space/21293583526wu9pi.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/Ohjj1jc/youtube_app_for_samsung_smart_tv_download.pdfIn PDF document text
    • http://bezigex.iblogger.org/potopoju.pdfIn PDF document text
    • http://spain50off.info/mojafupul9tosp.pdfIn PDF document text
    • http://instasurprise.online/69960033812euq01.pdfIn PDF document text
    • http://nukowivoxom.iblogger.org/affixation_word_formation.pdfIn PDF document text
    • http://odemebayisitrafik.com/treatment_for_stage_4_arthritisnxsi3.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/aheXOnT/65135284384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimoxorud.epizy.com/best_free_blogspot_templates.pdfIn PDF document text
    • http://tezuzatarezoz.epizy.com/73013738957.pdfIn PDF document text
    • http://pusejik.epizy.com/assistant_site_manager_cv_template.pdfIn PDF document text
    • http://rapevuf.epizy.com/black_boy_richard_wright_book.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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 5476 bytes
SHA-256: e0277e4caecef3976e08a9cd8c2368765e6ab7ce6a586cf2c2f1beaa574021d3
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 10036 bytes
SHA-256: f87cd074f293252dc71f8696223ae285b746bbfb6e1bbf6cbb48e9ae192c0cee

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