Malicious PDF — malware analysis report

Static analysis result for SHA-256 6182dd0b29117157…

MALICIOUS

PDF

73.6 KB Created: 2021-03-13 15:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74271f3392beccd5125d55a4f0b020fa SHA-1: 9e807bf9dc3969f080bdbfc08e63caf7722e6e56 SHA-256: 6182dd0b2911715793253293abd50d6a6b018befa7d6f7071375d320d96ad4a2
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=cdac+dac+full+form
    • https://cdn-cms.f-static.net/uploads/4483082/normal_600d209f6c170.pdf
    • https://mutokanapagoz.weebly.com/uploads/1/3/1/6/131606569/4041974.pdf
    • https://cdn-cms.f-static.net/uploads/4381091/normal_6020944a8940f.pdf
    • https://cdn-cms.f-static.net/uploads/4417312/normal_6025a235a05a8.pdf
    • https://cdn-cms.f-static.net/uploads/4383321/normal_6031bd4563ee2.pdf
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/sesuwi.pdf
    • http://nakodinita.scienceontheweb.net/what_is_a_flavorwave_oven.pdf
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/7840750.pdf
    • http://zemesod.getenjoyment.net/finders_keepers_stephen_king_synopsis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dumojofirokagud.epizy.com/dyson_dc59_battery_charge_time.pdf
    • http://bogalibamadom.myartsonline.com/ribon.pdf
    • http://zesafemumibow.myartsonline.com/rupaxabugegapaferatuze.pdf
    • https://uploads.strikinglycdn.com/files/5bf12a17-ac2b-4dc8-b540-bb60a97c1ab3/defiant_motion_security_light_blinking.pdf
    • https://uploads.strikinglycdn.com/files/02c22ab4-4ca8-4f93-b87a-8446217eaf63/is_ps_vita_still_worth_it_2020.pdf
    • https://s3.amazonaws.com/vexosafugunu/c_nested_curiously_recurring_template_pattern.pdf
    • http://bazejufojowopor.epizy.com/carnegie_mellon_university_australia_annual_report.pdf
    • https://s3.amazonaws.com/gumegulaxi/free_excel_dashboard_templates_xls.pdf
    • https://uploads.strikinglycdn.com/files/33b56065-b0a9-41c1-b2c6-03ecdf397759/canon_business_process_services_phone_number.pdf
    • https://uploads.strikinglycdn.com/files/6e193321-fcab-4c33-b1a4-60edca6534dc/43117391041.pdf
    • http://bagugexasorip.myartsonline.com/49724478408.pdf
    • https://s3.amazonaws.com/zifilobesumafi/90347766472.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin
de23fb7bb250d685494095065b0a0fe84f43f06371fb0acc84f9f872942f3051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 4896 bytes
font_01_sfnt_off0000f1dc.bin
2f33917864ea810f1380dd61f2b31268ea482d1e08e656709eb648b5616c0b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 11148 bytes

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