Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcabe9a353f8b06…

MALICIOUS

PDF

72.1 KB Created: 2021-02-20 09:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 69a7ae48f73b0018c2580e65a81d6028 SHA-1: 9f2d14b5f3716b8752e9417f3466e836253caad4 SHA-256: efcabe9a353f8b069821fc4d98408cd0e7395bf480fc102bc6fcac5101baf78b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one prominently leading to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Vampire Diaries', likely a lure to entice users to click on the malicious links. The presence of numerous links on disposable hosting and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=vampire+diaries+season+2+episode+8+recap In PDF document text
    • https://cdn.sqhk.co/godajaxox/IhbPgfu/lullaby_songs_for_babies_2_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/iigfEhj/minecraft_tutorial_world_download_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5ffb55e6db4ea.pdfIn PDF document text
    • http://rafonuza.22web.org/boss_therm_bps242rf_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/dcshjuh/fekavigona.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/DLAgj5Y/totuzafukiwimogoruwurut.pdfIn PDF document text
    • https://cdn.sqhk.co/fafegatoko/d6Cgcjl/fijunofogiwegaguz.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/hemFoie/stackable_rings_set_kay_jewelers.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/Mjgdkhc/39881626866.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/R4OIUjb/97026410404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fe231ce6fbb9.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/eicihhi/81900743656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujatubaniza.epizy.com/battery_percentage_android_10.pdfIn PDF document text
    • http://burerekel.rf.gd/96675128387.pdfIn PDF document text
    • http://zawozunilutufu.rf.gd/android_mobile_restore_software_free.pdfIn PDF document text
    • http://ketugida.rf.gd/best_sheet_music_composing_software.pdfIn PDF document text
    • http://pababevo.epizy.com/nutubunilepedorivi.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_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 5476 bytes
SHA-256: 77df5408f104fe5255b977e7368a8f68db12dc1dff5477f933f957053661ea5c
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 10324 bytes
SHA-256: e25ce6ebc6cf939db8e003d4407c3665c241c9f7eaf8d539b942a65a71c9db29

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