Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e45bef4a8e8914…

MALICIOUS

PDF

97.5 KB Created: 2021-05-07 23:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 49f10ebb8cbfc1e703849be16a20e3a8 SHA-1: 9841fb03b8b0b0e9f95b9752be0c6da25d9e344b SHA-256: c5e45bef4a8e8914d540f18bd7c5048ffe2f5de777b541b7b6011d2fb589e9ef
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+plan+a+virtual+conference PDF link annotation
    • http://jaxagogilexet.sportsontheweb.net/guided_imagery_scripts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_6054218ae4f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_5fd10d51ed23f.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_5fce69343e472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_604014b634c97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83e32b2-9085-4c41-acc0-95672c88a858/how_to_crochet_a_beanie_hat_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500e576d-55c1-4149-8ff4-b276b5652a4a/13479742888.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_8a6bb19ba6444f16bf41feac4757a5d4.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_d1d2c8dfe63a4b239b289959acd493cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf6eadc-3f02-45f2-967c-5bfd322ef39d/how_to_reset_a_radio_shack_pro_97_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/desajozeremor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120e4304-d8ac-4677-86b6-d77ffce8be4d/44928944082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823959c7-65f1-4c80-9d5a-dc36f0c77d9d/what_to_put_on_resume_for_customer_service_representative.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/61936629992.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/zegebikof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86538f9f-96f4-4fb3-a9d0-f49f8504c503/razor_simplest_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1740eb3-a52b-484d-8f03-e960c1f37680/how_to_harvest_seeds_from_lettuce.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/wordpress_user_rights_management_plugin.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_1b4c72eea4db42e388e4927b0704370c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xirixepo/81353070247.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/how_many_times_bigger_is_betelgeuse_than_the_sun.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_184ffe5b6e414960971a364307a79c7d.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_off00013fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE4 4944 bytes
SHA-256: ce4bf1338ef1118d46cdeb437b1badd13afc0127305e71b8f481a8cc53719d61
font_01_sfnt_off000150e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E2 11768 bytes
SHA-256: b0d056701822898956decf5b3a39a3d1fce8abd41a54eaf4806b5fd3da9ef8a8

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