Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf171c1801e77ed7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 03:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 43542461f31a496c2d83fbc912f6161c SHA-1: 5d45708630976399de6a82b10521ce9f8a08d00a SHA-256: bf171c1801e77ed7748a743f43a22f6a4656f80e88b5f69eda937b696c329bef
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being a phishing or malware distribution lure.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=yoga+for+fat+loss+pdf PDF link annotation
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/kezod.pdfIn PDF document text
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/8075833.pdfIn PDF document text
    • https://cdn.sqhk.co/baponakazu/DY5phja/export_google_form_to_google_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/jfighbh/47694576804.pdfIn PDF document text
    • http://togaxifobuf.mypressonline.com/ielts_speaking_tips_and_tricks_academic.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/semesepudub.pdfIn PDF document text
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/wezodomovefumu-nujase.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/95991358819.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/34175400432.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/nikijinus.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/1535719.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/1596898132.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/ef799fe67fd5fde.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/fubevewurozu.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/885f4c04-13ee-4eda-85ce-81d3b694e0af/35801975221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb349aa-0a1d-407d-bce6-dffc389c49dd/the_heirs_netflix_japan.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/tarutefixebo.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/simplehuman_tension_pole_shower_caddy_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0de93c1-3b68-49cc-98fa-742c41e6e106/la_crosse_bc-700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f536ffe9-737e-40b4-bd64-7e480776dcb0/nixadisom.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_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 5172 bytes
SHA-256: 1e42a9cf93f2d90ac83b626b6938ff08c38bd5fc390d81036e70168902149ffb
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10592 bytes
SHA-256: bc53c8fc9458756ea5b55905e7509db1fa375fc47c7c4895353120531845338f

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