Malicious PDF — malware analysis report

Static analysis result for SHA-256 d658d565c6998a23…

MALICIOUS

PDF

80.8 KB Created: 2021-02-26 01:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d252298987e0dbf78c6a9199e4fe842e SHA-1: adda175db433cf3fdf75207c64336fd9531f991a SHA-256: d658d565c6998a236eed558c66088af17c0deca97dfb846a3597a213cf3f4fb9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=kill+team+commanders+review In PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5ff346508872f.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/nagutovidurezuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fd0c25991f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd33259868d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5feb109b40135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_601a45cb9bf01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_6021956937bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_601ffa06da67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_601ec7859f9f0.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/kafises/cv_template_word_free_2018.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/88593402059.pdfIn PDF document text
    • http://jovawat.epizy.com/dyson_airmuscle_dc28_manual.pdfIn PDF document text
    • http://resisimokopi.epizy.com/cardinal_newman_school_uniform_hove.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/video_games_lana_del_rey_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/56467638847.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/the_royal_ranger.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_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 5204 bytes
SHA-256: dda762c8908a1b214fe006d723307c7f4866b5e133b3ca6349077bd12da4e2f5
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 11300 bytes
SHA-256: 54af62f22ec9fbe9d1bcc9208977d1e4a7137a68623659c1d42688f61f50fa50

Open this report in the interactive analyzer, or submit your own file for analysis.