Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7ba0c43e094cf4…

MALICIOUS

PDF

70.8 KB Created: 2021-06-07 16:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d6034f28779d9dcbf3137528279bb1e SHA-1: 9e47f9e0238fad2da10ea34217f86141667e1e2d SHA-256: ef7ba0c43e094cf4a2d7849f69183487d4e19ed46f419be3ddf75026894f38df
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-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://crewmak.ru/pbw?utm_term=what+was+the+impact+of+imperialism+on+china PDF link annotation
    • https://xivitazekovobun.weebly.com/uploads/1/3/4/5/134596583/vatov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485451/normal_6005890ddfdcb.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/5758920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_6039a897b7eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_5fe62a9c8b07a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalemofe.pbworks.com/f/96030581812.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/imyfone_lockwiper_registration_code_and_email.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144611202/16863032019.pdfIn PDF document text
    • http://fozujedax.pbworks.com/f/to_kill_a_mockingbird_chapter_11_courage_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed7a92e-2641-497d-bd6f-b5fc409d337d/the_witcher_3_walkthrough_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985215ac-4c6d-40e8-896c-19b0fe249884/kamemetof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfc8969-a413-4457-a077-d75d23a0fada/samsung_ue32eh5000_remote_control_code.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/88486399550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3301e8e-2aee-46a9-adb5-35b30ffddf8f/mopadupamapetitobikigok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e01eac-8df7-4e44-b059-a3effbff6ec8/juraromuroxezosonabazulu.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/63604448730.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 5360 bytes
SHA-256: 529bb5731f3537c000e68eebbe37cf7179557c775214aa4a0735212cfcc2488e
font_01_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 10468 bytes
SHA-256: f8b7623ca7510397f08309d86e8d2b9d3f418963ff841f0a39acc3b8151348f5

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