Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda645929f155e56…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 05:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d44c84fcbcc188476a909ba96bbf5b55 SHA-1: d961c4bc35f86272ce8ee1aaa8e2f13336bde67b SHA-256: dda645929f155e56705cf8556645993ecbb40bc21a6427d3e01296e54c03218b
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically a 'Browser extension / update installation lure'. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential theft or malware delivery via the social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xajibur.ru/wix?keyword=elmcroft+senior+living+employee+handbook PDF link annotation
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/5771475.pdfIn PDF document text
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/1894557.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/3584765.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/pugaw.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/9c510ed4.pdfIn PDF document text
    • https://kerawitoges.weebly.com/uploads/1/3/4/8/134878251/3161093.pdfIn PDF document text
    • http://joruzutababu.22web.org/salem_lot_1979_full_movie_stream.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://s3.amazonaws.com/tafogusegabomu/bahama_breeze_nutrition_menu.pdfIn PDF document text
    • http://xogimutidum.epizy.com/vulupesejariwu.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/risazedejazif.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_264e26f1a6c345e39e5e4f83df2a9551.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/movamemax.pdfIn PDF document text
    • https://7162416e-a815-4e2e-b4b4-2f1b6d3d7a1b.filesusr.com/ugd/0723a7_e59910c0ed0544b2aa2af6685bb93687.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_c425871d3ebf450885eb8cb54200e94f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorogamat/bahubali_1_full_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/44006098920.pdfIn PDF document text
    • http://rigamijuzekup.rf.gd/military_asvab_practice_test.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_3c0da2e1e2804cf7bb08a24041979d09.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_4e628a74898b435c9b7590d2926ee213.pdf?index=trueIn PDF document text
    • http://depezure.epizy.com/information_literacy_definition.pdfIn PDF document text
    • http://tibupud.epizy.com/is_discovery_of_witches_on_netflix.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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 5680 bytes
SHA-256: 6a4b578271fcb33816224357fe0862790f5f8ec6733b3a58dac282da0340435b
font_01_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10224 bytes
SHA-256: a2d3e561494f8f6c1dccd55965987fb01cceb38b3b92166e9c8220c11b81c38d
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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