Malicious PDF — malware analysis report

Static analysis result for SHA-256 634becc2025c0ba4…

MALICIOUS

PDF

106.5 KB Created: 2021-03-20 17:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 69bf343e26fc8cd9a79a4e0a220a51be SHA-1: 9993821da62b38851f972ffc548c84d38e83b5c3 SHA-256: 634becc2025c0ba4b715cc2ac481ec1b5a0d7b751df7c4eb8c597efba0dbb822
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on directing the user to 'jottigo.ru'. This URL is part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=which+word+does+not+belong+likely+probably+possibly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480889/normal_5ffe6b79cad41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_603bb55221217.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/ia7jjiH/nanipirizeda.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/6081071.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/takuzekop.pdfIn PDF document text
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/3003256.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/gifuve.pdfIn PDF document text
    • https://cdn.sqhk.co/tisezalave/ghaiija/lirefisejijesisug.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/ihehfzH/bupekumebotovere.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/gc7WvOV/sumixudasejetavuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/yicbDig/jezal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_603d1591e9218.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/8ghiaui/tiduxizapegirawaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6017629a6594e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_5fc88a4c4baad.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/hhhfXDV/lisimun.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/xudozetubipaviferivi.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/6864531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivirujifija.epizy.com/setup_belkin_n150_as_access_point.pdfIn PDF document text
    • http://dukanikurov.rf.gd/66609045709.pdfIn PDF document text
    • http://gaxezakowe.epizy.com/soulsilver_eevee_evolution_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off00015d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8B 5744 bytes
SHA-256: 5373b65c692f51d26cc12f2e70cac24d8ae2bfd7258b57fa1d34796de46f0dc8
font_02_sfnt_off0001712f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712F 12564 bytes
SHA-256: b4a33b2e669d913950e23181552610220677ccc268c8dbb5ea1a1e766a82b323

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