Malicious PDF — malware analysis report

Static analysis result for SHA-256 d343b0fc8229ced5…

MALICIOUS

PDF

78.8 KB Created: 2021-03-23 01:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bbc2b78014eb1f5e150dc515f61e09f1 SHA-1: 9803acd6349b143232f4f7804e7dbc75e0cf825b SHA-256: d343b0fc8229ced55510ff6a3b2130b0c0bda781e78d55a06ac55862f6b8ca10
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://jumiwimov.ru/strik?utm_term=what+is+the+effective+compound+rate+of+interest PDF link annotation
    • http://nilubalab.22web.org/76663407155.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/gTL46y1/brimless_hat_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/L71jiXs/bebuwesobapuwurirojek.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/zaJidii/93144911449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_601cb2e1261ce.pdfIn PDF document text
    • http://peramabejakes.sportsontheweb.net/elimination_of_bias_in_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_604a66fbdf658.pdfIn PDF document text
    • http://pesowulil.iblogger.org/alter_ego_5_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/geCgjhi/blackberry_content_transfer_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/biahaNI/16193841282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabetalofel.epizy.com/54084197767.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_2feb0d70ee444f6c9dc31e2987aaae49.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_5673434e5b0b4e17a40f0cdf8f3601fe.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_e49a082238e844fca1cab42adf299421.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_e73eee4889f240a9a31326435cd064c1.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_b9949be0f02a4ec282e902bd9c3ad8ef.pdf?index=trueIn PDF document text
    • http://tiwisuk.epizy.com/nexutawenogosigowa.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_1f3d28df283f431eb1bd4bf064dbec2d.pdf?index=trueIn PDF document text
    • http://katufimeg.rf.gd/pukavaxugipijobipitokof.pdfIn PDF document text
    • http://jemileti.atwebpages.com/29704857272.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/matomatag.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/business_management_research_proposal_sample.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_a09314a7abad4cf9b509b88864179c91.pdf?index=trueIn 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_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 5436 bytes
SHA-256: e76df6f5771c981ae69d70869c0e54f6d1efe22015426933551a185ed8eb41fe
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11084 bytes
SHA-256: 5dbda0e5ce0ed75cad2bbf86072bc465d597b2a8ebf0a0c223964008060a6299