Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f5d0a6c39a1a34…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 07:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66e223ec48d7da8724499772a949f164 SHA-1: 1455966a526a9a84fbb153785c68c84c0c395700 SHA-256: 10f5d0a6c39a1a34dd1c86eb1ea611e5f8c09716cd8f40f3f9f6333c7913fdcc
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 0.9994

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://nipisod.ru/strik?utm_term=spiral+dynamics+debunked PDF link annotation
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/gobuvixamadowatu.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/70aede050b1.pdfIn PDF document text
    • http://goxonivibewe.22web.org/cisco_jabber_user_guide_11._5.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/4477871.pdfIn PDF document text
    • https://kilewesiviteki.weebly.com/uploads/1/3/1/1/131163613/kewabu-boposodituwenu.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/luwavofuwubu.pdfIn PDF document text
    • https://wazidufadik.weebly.com/uploads/1/3/0/7/130740116/c14cd.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/4a013da0-8133-42f8-8c6c-bc825bce9d53/tp-link_tl-pa4020pkit_powerline.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/dorothy_dinosaur_cake_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66799a3f-6ec3-44aa-a3ad-1b57b734696f/fagor_rapid_express_pressure_cooker_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ed611b-beb6-4ce8-84a2-557890ac8cb2/disuzivoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f980a23-9fb9-4b07-95f3-17372a3ad59b/how_to_make_an_android_app_for_beginners_in_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257f6666-2568-4789-8489-b73f2bf68dcf/dogoxopukugan.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_e513abaefa5d4e99b89837ed50c78114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e1c4dc-38c6-4687-87ac-b5804bfdb221/tuverolepaxusafovufug.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_e6232c43923549b29a236dad1f3bdc8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c308f680-78ca-4497-b5ad-f2c54192d868/nextbook_ares_8_stuck_on_startup_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71702ff3-befa-4f6b-aed3-844b1687768e/how_do_you_charge_a_fossil_hybrid_watch.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_4e9e852f007e412bb6374002668e6a97.pdf?index=trueIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_55cb9ad930644c46a7a4209f551bf9aa.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_97fcb1bb98e74a199e0d0343852baf1c.pdf?index=trueIn PDF document text
    • http://pidukegub.epizy.com/holmes_air_filters_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0752124-d5be-4781-bf42-ab0ce776ed48/wunorapepekafunipi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 5628 bytes
SHA-256: 7ff7cf84071a854c19c4205a476d34629d8fc12d2edd94f3db072d29e6dd462d
font_01_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 10464 bytes
SHA-256: 2a44faeeeb057300cb6a2b247cf93c389556178036b38ea79a1615c6186a93f1