Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a98afb6641a8d18…

MALICIOUS

PDF

75.5 KB Created: 2021-05-05 05:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 800ce3ab5d506d3efbc22c0ba481c67c SHA-1: 13fba809a6ac0ed7d349ca8e82d8cb8908822047 SHA-256: 4a98afb6641a8d186b501f855f366b91526615c8d629536b60ae2ef3137ab159
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 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+reset+swann+security+system PDF link annotation
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/6795727.pdfIn PDF document text
    • http://jotepuxigavof.iblogger.org/blender_video_editor_32_bit.pdfIn PDF document text
    • http://mexuzekinukogip.iblogger.org/hootsuite_social_media_trends_report_2019.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/92cdcc75.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/cujfrFP/70859679876.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/uieigkY/empires_and_allies_cheat_codes_android.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/2318308.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/Xhjhiih/19973426657.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/xojon-dadiz-fasezowogeruteg-wafev.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/foxarezopojote-xadop.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/iihgc1T/52335013697.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/vewozuxi.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/diniwuzalisorukevela.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/djjgjs3/burekem.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/hiB3igl/pocket_league_story_2_training_combo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/635e0566-4ff3-40a5-8c27-bc3c2368a595/59238379098.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/77827352175.pdfIn PDF document text
    • http://vagelebab.rf.gd/polarososutimete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ec9d22-d182-4d6e-99a5-d3ea9f82f556/98257079196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d4fa5f-8bcb-4573-9fb2-b90c134330fb/88843580878.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_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 5068 bytes
SHA-256: 11e05794f82aa393c18ad1339c257ef01855a0fa4cf6e559c21f0e3935a44b6b
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10860 bytes
SHA-256: 5e4bea9f7c50edcc7d5cff15efc4864ef83d2b4477b80cd81918c2357d692a79

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