Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41a5ebe02a5f57c…

MALICIOUS

PDF

101.2 KB Created: 2021-04-03 15:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a3e9d32922289f3b4f85646ed46d66eb SHA-1: 1802d3a3e941b9245997d1fbacd72407f36df8ef SHA-256: d41a5ebe02a5f57c29697c8cb88f9d6cc1722621b2fd0722e227f969691b7add
156 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 0.9994

Heuristics 5

  • 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.
  • 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://nipisod.ru/wix?keyword=shadow+man+mega+man+theme PDF link annotation
    • http://jivusibofonefud.mygamesonline.org/how_to_work_a_dsc_alarm_system.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/32275289604zry9w.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/tamoguwitobaxewilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368954/normal_5fe54d294ba2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_60392280a5fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_600a3c0fccef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5fed187626a82.pdfIn PDF document text
    • http://requiredjokblog.com/el_corn_en_espaol_completo20brm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_601993a721e07.pdfIn PDF document text
    • http://memisada.mygamesonline.org/osmolarity_potato_lab_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/81644251008.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/electric_scooters_repair_shop_near_me.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_b8c53df62ff3429a9aa2a25dd029255c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/hearsay_objections_cheat_sheet.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/alimentos_antienvejecimiento.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/deep_freeze_windows_10_serial_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/how_to_sync_skullcandy_push_ultra.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/online_software_project_management_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/bluestacks_for_laptop_windows_10.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_d85032a2801940b3802489d5f36c3661.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_5ddd6ff89b674160852484566e8eb856.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_7cdc5eb6b6924b71a882a964b86517cd.pdf?index=trueIn 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_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 21140 bytes
SHA-256: 14eeb1364263ec5694a867a4a2a3fa0dc58187e5af5f134850f11a217e9c06da
font_01_sfnt_off00014ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF7 5128 bytes
SHA-256: 9e8fff254978f0c527c19bc4b8134df9c9556854b38f4a2ce7ee753a7ca1cbaf
font_02_sfnt_off0001605a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605A 11688 bytes
SHA-256: 4ccd18dbc25ba4833cf88c1fadc22512fb000bf642bd60002e8d453425de7277

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