Malicious PDF — malware analysis report

Static analysis result for SHA-256 6668a0d0ce64db41…

MALICIOUS

PDF

81.2 KB Created: 2021-04-25 10:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bcef3d8e9be819e8a54c8c0883ed7e4c SHA-1: df91acc46b98f1433e7632193eade8840dee9b56 SHA-256: 6668a0d0ce64db41e6c3f77bc2f11c612bdf609f6d5b7d587e1dc0d1cb1583e5
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various domains, many of which are disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=g+shock+ga-110+job-1a4+price PDF link annotation
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/fiwaxemufajetaleg.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/3779738.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/how_much_water_does_a_speed_queen_front_load_washer_use.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_602927f666cdf.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/joker_graphic_novel_harley_quinn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_60490af863423.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/cema_belt_conveyors_for_bulk_materials_7th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fc86c75be285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60572092d19c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_60142cb600032.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/4cae109f316c1a6.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/circulatory_system_worksheet_grade_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_601f57a0bdd06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_64efb94c4f944ee8be15c50bbb6f85aa.pdf?index=trueIn PDF document text
    • http://sovogezo.atwebpages.com/fazipitalax.pdfIn PDF document text
    • http://jojulupijawide.onlinewebshop.net/tuxiziredis.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_8af1c398e3574ccf85a6f02e1719691b.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_86a7a40cc5bb4a36981629f60cccb88f.pdf?index=trueIn PDF document text
    • http://bugenerefajujus.atwebpages.com/matlab_grader_blackboard.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_a8ae24c9d54e4e47bbbad3a9cadf726b.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_102cd75d6fa24ed9b2fbeb7f268f8876.pdf?index=trueIn PDF document text
    • http://vipuzala.myartsonline.com/types_of_general_anesthesia.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 5788 bytes
SHA-256: 991f074b6ab814cf8a157340ea62a5182103e1a82768515597e819518e074177
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 11108 bytes
SHA-256: 7f24eb6368648d606d2b9a619cd687f8e5eef5df1582acfe086a3a1cade292dd
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16060 bytes
SHA-256: f5c33ee07bea7cd32fbd6d7187728561cb8e33ef2c55140341304239d40392b9