Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2135168982e9f94…

MALICIOUS

PDF

69.2 KB Created: 2021-06-13 11:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac917d73ea3589f48e9b607181827d69 SHA-1: 054eb6ff75b54dcd8485c7ba657487de7eda9fcc SHA-256: d2135168982e9f94dea27962b0c54696987e5553bbc7014b1bda3ea0c07e2bef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=naruto+ninja+storm+4+rom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449410/normal_5fdbd867cf04c.pdfIn PDF document text
    • https://gerutabelamulef.weebly.com/uploads/1/3/1/3/131384559/xanogedapipijafep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_605f0b83ca43b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc78e940fcbc.pdfIn PDF document text
    • https://sisuwajad.weebly.com/uploads/1/3/0/8/130874073/tazunikulewodurozaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_60365f2584cbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffc3a4e9c7f5.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/77684fa03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_60539f7cb355b.pdfIn PDF document text
    • https://fogevama.weebly.com/uploads/1/3/1/1/131164507/e3470725d3.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/7258585.pdfIn PDF document text
    • https://viwetefebelogup.weebly.com/uploads/1/3/1/8/131857445/jilit.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/tuvaxixakeled-robasidajin-zemolovi-bubumatapidod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufugaref.pbworks.com/w/file/fetch/145094112/love_ni_bhavai_full_gujarati_movie_download.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442800/nitro_editor_serial_key.pdfIn PDF document text
    • http://gowisiru.pbworks.com/w/file/fetch/144816981/conectores_textuales_en_ingles.pdfIn PDF document text
    • http://pojaweku.pbworks.com/f/how_to_renew_snap_online.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/kirigami_pop-up_card_tutorial.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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 4932 bytes
SHA-256: 494789d1e242d9a5c6b3825579c6d73be614004cf7dd8451922b62b4564a3479
font_01_sfnt_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 11576 bytes
SHA-256: 6a8e204cf6404ff6e4bd33f5ba6ce97793a1c1a1971707be1932d1579db76def

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