Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23b5b8e2a992bb6…

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 15:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e9541de0b60a01a2b3441113a7ddb9a1 SHA-1: c296b678a16c425f0db0b8bb6f9ab4e04440c051 SHA-256: f23b5b8e2a992bb677197d132d124840a58cae3b79d2c168788569bc68b6e927
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+to+think+like+leonardo+da+vinci+free+pdf PDF link annotation
    • http://buytoday.cc/788977823142ja5i.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/zasonolojidudogub.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/nikosogatarizatogorar.pdfIn PDF document text
    • https://suvoneretalepa.weebly.com/uploads/1/3/5/2/135299969/5142800.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/what_are_the_goal_of_educational_psychology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fdc7a503c3ab.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/gTd1jba/strawberry_shortcake_bake_shop_unlocked_apk.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/zofuluzigasoku.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/gfIDMgj/mars_vr_oculus.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/tugovatej_bugutijuxupada.pdfIn PDF document text
    • http://hookup673.site/97885942896x6n2h.pdfIn PDF document text
    • http://reduslim-europa.site/white_out_meaning_slangxiy16.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/white_space_graphic_design_definition.pdfIn PDF document text
    • http://remontlegko.info/swedish_alphabetp7ev8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5ff16e5eb9273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fd629c664ea0.pdfIn PDF document text
    • https://muwilumi.weebly.com/uploads/1/3/0/8/130813533/mabelog-gosaleto.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/gokixegoxoxiku.pdfIn PDF document text
    • https://batuginuvitewaw.weebly.com/uploads/1/3/4/0/134013132/xofujivabuteri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/72479155660.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 5240 bytes
SHA-256: 8e3bd167c482ac62a8e92e6e8cc6067fbfad04584d3bc13f495719895f1b7538
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 11520 bytes
SHA-256: c6f2bc2d41de26412ca120b4f7109c35276a2a4289bf924b89b8dc2e53727d04

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