Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3b3d6b9307f321…

MALICIOUS

PDF

86.0 KB Created: 2021-03-27 21:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a4df72173a422a9d0dcd408f324c46ab SHA-1: 968c580721fc042fefa5d897ed8436d23311d740 SHA-256: ce3b3d6b9307f3215e7cd618b45402d3df0d7c9e3497512f3ed216e2d5292c61
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 0.9983

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://gimoguvi.ru/strik?utm_term=que+conlleva+tener+un+titulo+nobiliario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6016c91dab2e2.pdfIn PDF document text
    • http://zdsshop.top/how_to_make_phthalo_greenotifi.pdfIn PDF document text
    • http://life50it.pro/does_the_salvation_army_give_out_food09ahl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_6059ec2e0bce8.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/the_revenant_book_summary_sparknotes.pdfIn PDF document text
    • http://lisolu.org/vokaxorojusimisag1dt9g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_603e1981781a5.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/luvelizuxolufu.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/ec8ad796f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_604f57ecab985.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/4231457466.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/bluebeam_revu_extreme_free_download.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/5318005.pdfIn PDF document text
    • https://dezojase.weebly.com/uploads/1/3/4/7/134711134/misitugikowuk-dobavaxubegapi.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/xatotetenevulim.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/wosozarazozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_15abc1a29a1740659fdd30657eba5c8b.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_fcd09ceb9a324246a0eca53caf8403a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3930e7-f94e-4f0b-923f-dbc3bc4e85bf/business_vocabulary_in_use_advanced_book_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c70f69d-9df3-46cb-962c-dbd42ae19f58/37149171700.pdfIn PDF document text
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_ed6c55c0dbfb4e088c64fcaf44a9a20e.pdf?index=trueIn PDF document text
    • http://sisufovofow.atwebpages.com/crossfit_workouts_with_weight_vest.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_3523a81f9a9047eb875b137319d49617.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_e79f2d8f4c1d41278e8230800e92dc56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b83e0cc-5eef-4d9d-8ec7-2db0c82b0702/aws_welding_symbols_test.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 4756 bytes
SHA-256: 0873b4d0f5f648c53523179a72e8cf9691e5b47742fe493fb0eb43a6525dd08c
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 12476 bytes
SHA-256: 84638a0ccf54092a5cd5c17479639c80a0ed16868c5277ac8170c6bb3f47de30
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16632 bytes
SHA-256: 7ed423fd6f64a2accaab24a388a557cab9318e50e2ef4475c53ca1e35efe0f17
font_03_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333