Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d2a60d158916df…

MALICIOUS

PDF

82.9 KB Created: 2021-03-17 19:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1d0c8d73814989745148226cc908c80c SHA-1: 9f239093aa08cca03b839176ceb007a1394d36f6 SHA-256: 86d2a60d158916dfbc89fa3fe1f6b9678fbc6944f50547d22126bcc704eaec08
226 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. It uses a LOLBin command-execution lure. 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 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://druttle.ru/strik?utm_term=will+there+be+a+fourth+kane+chronicles+book PDF link annotation
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/mebavunevob.pdfIn PDF document text
    • https://luzijegeze.weebly.com/uploads/1/3/4/0/134040843/mamusogeb-lunoxez-reruturog.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/kilelenemonolele.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/julepa.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/c7405969faeb311.pdfIn PDF document text
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/4253646.pdfIn PDF document text
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/zapanetixazutun.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/f1eda.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/fedc2154ec83335.pdfIn PDF document text
    • https://gezalimod.weebly.com/uploads/1/3/1/3/131379194/40376243.pdfIn macro / runtime command snippet
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/vuvosigivovuzenuka.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/a20546faba15e7.pdfIn PDF document text
    • http://mazonenebu.22web.org/romujexefewamopat.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/zemavowu-zesun.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/1In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxarafepemu.epizy.com/52504549495.pdfIn PDF document text
    • http://gewuvuvemaguda.rf.gd/how_to_restore_windows_7_using_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9efc861-0474-48e7-8210-ed70366f4f9c/how_to_wash_pack_and_play_bassinet.pdfIn PDF document text
    • http://remofexemuja.rf.gd/bhakti_bhojpuri_gana_ing.pdfIn PDF document text
    • http://vumesurev.epizy.com/pengendalian_nyamuk_anopheles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8e7949-0a3f-404d-94e8-4085628178b3/estrategias_de_lectura_y_escritura_para_segundo_grado_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f95856d-7449-419c-82dd-3cb3a63a397c/how_long_does_a_brita_bottle_filter_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d25c68-f07a-496c-90e5-17d58410a73e/visivujezubixanalazuxuki.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_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 5184 bytes
SHA-256: 7d7c8ca862bb0b4f5d7f15696c8381c3f652c1656155ad2e4383b246932acd84
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 11632 bytes
SHA-256: c4b227a810015f880f097d1ef955f0c362695e0d2286dde7897e09405bf58da5