Malicious PDF — malware analysis report

Static analysis result for SHA-256 3107bf381d1a5d80…

MALICIOUS

PDF

74.9 KB Created: 2021-04-12 21:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b0abefadeb4245df7b7ea5cb1f683c4c SHA-1: 010744d6f48ba7c5c9d169a576062ae9c0d745eb SHA-256: 3107bf381d1a5d806e8174918dac9d756f37c1dd7bf49ffa362e3d47683cd5d2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious 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://botokaw.ru/strik?utm_term=who+is+rab+in+harry+potter+6 PDF link annotation
    • https://cdn.sqhk.co/fiziroluj/jfVjaW7/jugar_piano_tiles_3_online.pdfIn PDF document text
    • http://5coupons.info/how_to_eat_3000_calories_a_day_bodybuildingh0eni.pdfIn PDF document text
    • http://wusator.mygamesonline.org/fotemojunavovasakosem.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/77699275767.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/uPJq9hf/21737739459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_604459e11f4cb.pdfIn PDF document text
    • http://auto-fishing-rods1.club/college_assignment_formatc7xx2.pdfIn PDF document text
    • http://wisajekunitope.22web.org/holy_bible_english_version.pdfIn PDF document text
    • http://fegekeketed.22web.org/automotive_software_engineering_principles_processes_methods_and_tools.pdfIn PDF document text
    • http://ersoil.fun/zozijafubizyhy27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_605bf364e29e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gfRwdie/phoenix_craigslist_for_sale_furniture.pdfIn PDF document text
    • http://mikrotikwizard.com/40098220840qt06b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukuselumetu.myartsonline.com/52836097061.pdfIn PDF document text
    • http://zonokuje.epizy.com/lawebotafajudijubatolek.pdfIn PDF document text
    • http://fobivojaburako.epizy.com/51808005745.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/82635261812.pdfIn PDF document text
    • http://bajobakokela.epizy.com/visepibaw.pdfIn PDF document text
    • http://bolopob.epizy.com/45583364733.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5284 bytes
SHA-256: 746dea9a630311bcb1097ae99f839c735744a9a4fd658c2161353cdf739ad08b
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 11400 bytes
SHA-256: 8024cfdde6a01fc6eb4047db39967e55abc7d06b7e624c2d326371e2991776df

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