Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b48ee71c3cccf4…

MALICIOUS

PDF

90.4 KB Created: 2021-03-30 21:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eca36805e79ccdefed7dcc1c84b715e6 SHA-1: 1a78b53479e36f3d6ca1a7e8e4e5c43adca35d5a SHA-256: a1b48ee71c3cccf41d0a9c72b95b7d06817cb4c53d52b91435d76632ff4a571f
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 0.9996

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://bologen.ru/123?utm_term=excel+vba+use+variable+as+sheet+name PDF link annotation
    • http://puveduxorapuba.iblogger.org/bileik_nermeler_test.pdfIn PDF document text
    • http://watercart.ru/331431594857xml8.pdfIn PDF document text
    • http://podarokinsta.site/titeminiokvqq.pdfIn PDF document text
    • http://trysalon.xyz/91937766025bjfgv.pdfIn PDF document text
    • http://organize.shop/90515540309312iv.pdfIn PDF document text
    • http://tenopokas.22web.org/cuentos_para_pensar_jorge_bucay_descargar.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://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_f5a376b28dc94a7ca794ac641df320b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c74c64-ace5-451f-9a99-92f546abd6c9/bryant_heater_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef82f46-0bec-45de-8324-bc103f4ee72d/godibitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff80a9db-8f3a-4782-bc9a-3d821ac87354/water_heat_exchanger_for_wood_stove.pdfIn PDF document text
    • http://bageradafasuk.rf.gd/marriage_invitation_website_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ac242c-9217-444b-b3bb-810ff7150f45/90544730878.pdfIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_b6a5cfc118b04a96b02685a86bb600fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panokojol/fetowofesizazip.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_5f243e8745e14cada5335074e9ada54c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ec88d1-6fea-4fe2-b50e-4660845ff349/vizekufem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ec7a78-86e1-4923-8783-005d287a37d5/tesla_model_3_dual_motor_0-60_non_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261e6075-94c5-4dbb-9a94-ae56c5e2f9fd/what_is_the_loneliest_creature_on_earth.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/harlington_upper_school_ofsted_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a06788-f6a3-4e95-ac55-bb89aebd111b/dipebikudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c00163-e9a1-4860-89b4-de1106d48e6f/vovutiwaxedelovefo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 5036 bytes
SHA-256: c1709d7e8831cb560540365cdd1c896712381b300f36f9aa97248add1821a9b5
font_01_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 11436 bytes
SHA-256: 0f5b5831f7dd9e943e312c5ac54908a69e7c6c5e8c8115d48c96a8481bb5ef6d
font_02_sfnt_off00014e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E54 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c