Malicious PDF — malware analysis report

Static analysis result for SHA-256 776893f8ba1e88d4…

MALICIOUS

PDF

71.1 KB Created: 2021-02-26 09:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 239b2284c0c890eed1862832ee1cf734 SHA-1: 23281abe782b64036e29fc6f94071f9943c34136 SHA-256: 776893f8ba1e88d45bdf0773ff56345096c86dcfa214f619cc5864ba52de4fa5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a social engineering lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=dell%20b1163w%20driver%20windows%2010 PDF link annotation
    • http://uspeh.icu/buzuralax7xy59.pdfIn PDF document text
    • http://bapozuwemixad.22web.org/baking_sheet_function_and_uses.pdfIn PDF document text
    • http://dkmz3.club/gefimolofebobidua350g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_60387cf17783c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff16c6be6b73.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/lean_management_training_ottawa.pdfIn PDF document text
    • http://dkblogin-de.com/how_to_use_verizon_hotspot_device9ho4o.pdfIn PDF document text
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/batedunaratomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levewome.epizy.com/jukegenuwugiwijobozu.pdfIn PDF document text
    • http://lanakupi.epizy.com/32451170962.pdfIn PDF document text
    • http://vetoraj.rf.gd/kutty_rockers_2019_tamil_full_movies.pdfIn PDF document text
    • http://jarawujutuva.epizy.com/investment_return_analysis_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/nexaje.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/arteriovenous_malformation_avm.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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 5412 bytes
SHA-256: 84e3e309efc6edcc5893695d8e99decb1e8692079f448739daf6d52fd5360058
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 10628 bytes
SHA-256: 57e75ce83e53c7e6eba450d0251de9f9cc60ddc443871bc1ed4b53eb81b8c4d7

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