Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b26505a7e02784…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 12:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a6c861ad76381439b90e1103353135ac SHA-1: a444252263d17a488b2ba360e82e46b683d5fd64 SHA-256: 66b26505a7e027841d27d85b9a15b5d3c44982e8410c5afa0c647570eaae8cc1
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the document's structure and URL findings point towards a phishing lure designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/aws?utm_term=metro+2033+redux+review+switch PDF link annotation
    • http://gravkamen.ru/merrill_lynch_corporate_credit_cardi53c1.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/cbt_nuggets_icnd2_review_lab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_602b429986ddb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fc69cda6a462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_6029acd6cbd3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5fddd740b0995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_602c97b522647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ff08950ec5a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff238550fe39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_600b27e2a8dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_60245e399829d.pdfIn PDF document text
    • http://picsonair.com/16556156758z50fu.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/george_foreman_grill_cooking_times_boneless_chicken_breast.pdfIn PDF document text
    • http://alania365.ru/nikowob9u6ej.pdfIn PDF document text
    • http://leafester.online/young_ma_ooouuu_mp3sjhjg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5fdd80489def4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_6011201ae1638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_601544db5b2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6026c8944adfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarusorujot.epizy.com/42159137566.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/88750146672.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/swann_security_camera_system_user_manual.pdfIn PDF document text
    • http://vekoxoke.epizy.com/blank_academic_calendar_2018-_19.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5448 bytes
SHA-256: d0c55c6bcdd899ff4fda63aece7a809b857217e3a6656995031f750f7d7dbb9d
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10268 bytes
SHA-256: 5001e2f9092d1c2d74dfb5f6e443a2e965cd0ad1cb2d81d1583a0a3a74df7019

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