Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cadf9cfb9aa9df5…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 20:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c08418ff2d4e2c026e00969a20a9eb62 SHA-1: 7484ff34a0ffa47a453c6ab80094533e83fcfd1b SHA-256: 2cadf9cfb9aa9df5d2fc927f489635cfaedf2d11bfec55ca2508aeb14a55c92e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jumiwimov.ru/wix?keyword=the+sims+freeplay+hack+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414360/normal_60006d6300dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_6055166ea2859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_6019112476489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fdbd63a01c0f.pdfIn PDF document text
    • http://lotobajigufar.mywebcommunity.org/makro_catalogue_november_2020.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/88973357602.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/adobe_reader_10_offline_installer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6057cdab8b086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_600f2bd96dc63.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/handbook_of_biochemistry_and_molecular_biology_fourth_edition.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/what_is_expense_reimbursement_revenue_in_real_estate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_3f12ce41a3344709a86f35eec3522929.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/cambridge_certificate_in_advanced_english_2.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/wonituzowebiged.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/calibre_epub_reader_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/hd_video_er_for_pc_online.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/giwil.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_819fd3d8db6b4f73b8c06c9a9836e550.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/25033048077.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_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 5368 bytes
SHA-256: 2cb489e7cec3a019c6baf27b5825c97ea4f594ec27dec5667b57d416ed4371d6
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 10788 bytes
SHA-256: 0aced19ff5f6fa05a21383d797fdd1ddd97c76f7739267b495c983ab134dcbfa

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