Malicious PDF — malware analysis report

Static analysis result for SHA-256 c859a8f84363c42c…

MALICIOUS

PDF

71.3 KB Created: 2021-02-26 09:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b82c422348d13f7849ce60bbfc3b9117 SHA-1: 45930be1ed1514c5825caa8b6a9e6fe9c8b1d99d SHA-256: c859a8f84363c42c0d65f17b9d5954991a60e7602292eb8e92b26b4aa342442b
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack designed 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://maypoin.ru/strik?utm_term=what+is+white+pizza+sauce+made+of PDF link annotation
    • http://miromawetibikew.mywebcommunity.org/how_to_use_a_bissell_ready_clean_powerbrush.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/duligubolapatisujipapig.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/idXifzV/tinetukepapulegogobifegi.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/ancient_greek_day_activities_ks2.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hbx4Swx/zunisevujijo.pdfIn PDF document text
    • https://bolowarokarov.weebly.com/uploads/1/3/4/3/134349384/3063922.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/duvawikasowaletixefafobum.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/41222162415.pdfIn PDF document text
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/2171843.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/mabojajobod_kanexexok_pegiralofujawag_mevuxakavebe.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/83969600165.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/change_master_code_on_vista_128.pdfIn PDF document text
    • http://teagreen.space/libros_quimica_general_gratisy99un.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/basuzinoxaxorivutase.pdfIn PDF document text
    • https://gusefokujugox.weebly.com/uploads/1/3/4/0/134040973/migixasixupawavujod.pdfIn PDF document text
    • https://xumagatovonag.weebly.com/uploads/1/3/5/3/135312495/kelefisukiwalawumum.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/RWegfje/heath_ledger_joker_wallpaper_4k_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/nursing_job_interview_questions_tell_me_about_yourself.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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 5424 bytes
SHA-256: 6ef31b3faa43703f9c4be5788410004645606f210137cb1aec5fd8f66c1ae7b6
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10376 bytes
SHA-256: 46ea041837eea701d4694c135bac57f2add39243c2a2a954d5746529d85cfd61

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