Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa1dd92b3858031…

MALICIOUS

PDF

83.1 KB Created: 2021-04-06 21:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6c614a6caf56950fe450aef68772810 SHA-1: 9950d027b124fe55de59ddfdf77ca68f13269db4 SHA-256: efa1dd92b3858031bff3b32ebbd73c5cc0f52c7625dc31a13529a42c7391a06d
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 0.9990

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://leonvi.ru/123?utm_term=samsung+bird+notification+sound PDF link annotation
    • http://kafemefiturokuk.22web.org/certificate_of_origin_forms_free.pdfIn PDF document text
    • https://jumugixaz.weebly.com/uploads/1/3/6/0/136028190/japilomudujipe.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/sig_p226r_vs_p226.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/36e6c93a7e.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/mogizapifazedipiji.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/demorisopizopi_xakumezis.pdfIn PDF document text
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/e884947cb6be24.pdfIn PDF document text
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/kusibinitoxo-deniwobokukat.pdfIn PDF document text
    • http://laruvunowos.22web.org/22535661814.pdfIn PDF document text
    • http://gegetamuwu.iblogger.org/bescherelle_conjugaison_allemand.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/5510371.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/data_warehouse_architecture_is_based_on_sql_server.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/angina_instavel_definio.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/5913042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_6b4fd1a659e54215bbc3f760b0f23c10.pdf?index=trueIn PDF document text
    • http://lolufijufafoz.rf.gd/azo_dyes_used_in_textile_industries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ace767e-bc6d-4ebd-84d5-986c15fe0d6d/how_to_wear_mask_if_you_wear_glasses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90224089-c314-4ae2-a33b-5fb45b60d8c6/casio_edifice_chronograph_wr100m_tachymeter_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469205ac-6707-4166-9ac6-6405bb88a4aa/itil_service_operation_concept_process_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73c7b3b-bc5a-49e5-9279-633328a1fdc1/77845531923.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_beea0a4a5d854a9788355f0b312a565b.pdf?index=trueIn PDF document text
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_aca37be671354f1fb992014719dbccb8.pdf?index=trueIn PDF document text
    • http://fijinibegomiba.rf.gd/81339864847.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/davewojezafebozegelagulu.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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5552 bytes
SHA-256: 9b0ef80cd3d76b52c250bb050e71e94bae95a68fde987f0dcc999be57969a5aa
font_01_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 12056 bytes
SHA-256: 824e923e197f3dbd8b9f1cd98fe815724f80f59797f2d329b5fba092cd948108
font_02_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 17908 bytes
SHA-256: 3eae1535e23056a95895d0d16c28e20687b167ce3f421252ddb6c98e76b99e1d