Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be5f252ceee78c7…

MALICIOUS

PDF

67.2 KB Created: 2021-03-03 16:29:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1eedd0a030de6ec5e43ec9911b3fefac SHA-1: 6f9a4ddd3de546d7374a5fa863d3ee58503a1d38 SHA-256: 6be5f252ceee78c7bcf4aa9d61f70ab9b48766a016c23415a4514f04506ee39e
126 Risk Score

Malware Insights

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

The PDF document, disguised as 'Ugly's electrical references revised 2020 edition', contains numerous embedded URLs pointing to suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics further supports this, suggesting the document's primary purpose is 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/123?utm_term=ugly%2527s+electrical+references+revised+2020+edition PDF link annotation
    • http://fbdirect.site/kaplan_university_singapore_information7501a.pdfIn PDF document text
    • http://teagreen.space/lyft_request_a_ride_online9uz3n.pdfIn PDF document text
    • http://lisolu.org/video_show_app_without_watermark65qqv.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/3729525.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/igye6jg/23137013581.pdfIn PDF document text
    • http://stavki.link/deixis_exercises_with_answersabzt6.pdfIn PDF document text
    • http://hookup671.site/bijuladazuvirizi2mspq.pdfIn PDF document text
    • http://stnold.com/guwedebxucz.pdfIn PDF document text
    • http://futudobofexile.iblogger.org/viwugurovutudukosipoget.pdfIn PDF document text
    • http://rubeatyshop.xyz/79826598347wzuba.pdfIn PDF document text
    • http://brumbum2.xyz/pemulinefapewejeqhnms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemusimovoxodan.rf.gd/kivetej.pdfIn PDF document text
    • http://wavubodalut.epizy.com/jenkins_test_report_xml_path.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_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 5648 bytes
SHA-256: 6383d32a771c14fff224c68834cb66fc26c381dce0762f7950f26e80ad33eac9
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 10872 bytes
SHA-256: 88a56bdb5ff02ed92baf890dde764b6603618a89326901540a2431b1a423b3f7

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