Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e585d856a5c983…

MALICIOUS

PDF

75.4 KB Created: 2021-02-14 15:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 675ecf37b26b6f9f394c2bf748712e8d SHA-1: 3c6e130d5360424ae94a7328e7dbd41a4d3f216d SHA-256: 57e585d856a5c98317815b162ee4f25f8a6c255ed400ee27e2656b070ff11e23
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many hosted on disposable domains, and employs urgency language in its body text to prompt user interaction. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/123?utm_term=goss+vs+lopez+issue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479679/normal_600f23cea0bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_600b227d9e1ff.pdfIn PDF document text
    • http://laxelenokuro.22web.org/79720234845.pdfIn PDF document text
    • http://fruit-ita.fun/singtel_cast_android_tvon341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5ff0b1431e94c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5fdc6f56511d3.pdfIn PDF document text
    • http://copyrightram.net/sonekivakorusavae9jel.pdfIn PDF document text
    • http://gozipoxeget.iblogger.org/sewajubunovadobav.pdfIn PDF document text
    • http://dazixetenulega.22web.org/analistas_de_sistemas_informticos.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/9693f5cc939814.pdfIn PDF document text
    • http://oneplusonemain.xyz/quote_letter_template_word723wq.pdfIn PDF document text
    • http://gprofights.ru/15228476434bkn04.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/e28189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozawexopad.epizy.com/mansa_musa_civ_6_guide.pdfIn PDF document text
    • http://kisolapuri.rf.gd/allegory_and_ideology_jameson.pdfIn PDF document text
    • http://gulogomolu.rf.gd/linux_command_line_os.pdfIn PDF document text
    • http://vazorilumi.epizy.com/coffee_in_italy_guide.pdfIn PDF document text
    • http://sukijikulo.epizy.com/parallelogram_properties_worksheet_answers.pdfIn PDF document text
    • http://folilef.rf.gd/bidimo.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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 4648 bytes
SHA-256: 6915f43fb1bceec232c34c50930130afad18a7d9535ac78a997dcbc809b73172
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10420 bytes
SHA-256: 1d697f7f9c7ffac91b4fa2b9474d564a043d61b500914c4bd071864da4b9b448

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