Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1399295ee98d77a…

MALICIOUS

PDF

107.1 KB Created: 2021-03-18 14:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ec9be4852c6370db4a722fdf7b0c4911 SHA-1: 6cf286074469bb43ad33937938df702c625615f1 SHA-256: a1399295ee98d77aac48c84a89259930e930b048603c15ac5b8721537b582fe3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/award?keyword=carmilla+le+fanu+pdf+english PDF link annotation
    • https://tuverasoxodos.weebly.com/uploads/1/3/4/7/134745130/6788885.pdfIn PDF document text
    • http://vukefof.22web.org/business_process_management_ebook_free_download.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/jemumi.pdfIn PDF document text
    • http://melifalafijuz.22web.org/46042640033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6011cf6c0ad75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_6018091d8d49b.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/9e516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5fc95f289080c.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/schaums_differential_equations_4th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_60421a83c8593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6014fb6e55408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fdedc2bd77a1.pdfIn PDF document text
    • https://fisujokogawubi.weebly.com/uploads/1/3/2/7/132711991/17e776f2ccb8d62.pdfIn PDF document text
    • http://heretythere.site/dash_diet_phase_1_lunch_ideas40cl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fe9643e48bc3.pdfIn PDF document text
    • http://artyom.guru/white_cake_recipe_from_scratch_no_butterj94ug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabonek.rf.gd/70440219266.pdfIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/1663478061.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/political_behaviour_definition.pdfIn PDF document text
    • http://lofapubuwuleto.epizy.com/adwcleaner_link_safe.pdfIn PDF document text
    • http://sedexajukewuxep.epizy.com/pimelofadakebugedajuta.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_off000162a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A6 5360 bytes
SHA-256: fa8539675fd16528aeb4b54994671d1ff9fdb050125d9378871d1b1719e26ce2
font_01_sfnt_off000174b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B7 12392 bytes
SHA-256: 4be18f3536dbccdf64af790ddcd4918c091fdd2cfcbb5534921998d8fa1ef61e

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