Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdbf6659e7f0ae0…

MALICIOUS

PDF

70.2 KB Created: 2021-02-22 02:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fbbe74c6db9893ab30600ae5710e9a16 SHA-1: 8ef9f87c57dc0a1c187daab1d2e8c191e3112a00 SHA-256: afdbf6659e7f0ae091f6d8f1ed408744f341e448f0e7b30456955551a63db70f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Sketchup pro free for students', a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://seumenha.ru/123?utm_term=sketchup+pro+free+for+students PDF link annotation
    • http://academic-club.ru/9619504641726oeq.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/ffe6dd.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/d8dd53ee5f.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/ia6hdjf/attendance_tracker_helpika.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/uXha1gc/love_ringtones_download_mp3_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419630/normal_5feeb13261091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_6006692a8f20b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff7cb114e3f8.pdfIn PDF document text
    • http://axecheat8.xyz/advertising_agency_html_template5sa4w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6019d949b21e6.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/BPjftja/ruromujejimexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_602a0f04a9fe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380539/normal_600853c94af3f.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/73ee51f7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/bexikerez/b3gd2jh/chuchel_2_dantdm.pdfIn PDF document text
    • http://naturalgood.space/pythagoras_theorem_historyg9rom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_602740528ecdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepurudevivo.rf.gd/pomanibopelu.pdfIn PDF document text
    • http://nojodesara.epizy.com/betelehemu_sheet_music.pdfIn PDF document text
    • http://litezopufesox.epizy.com/que_es_la_carta_magna_de_1215.pdfIn PDF document text
    • http://sarirasa.epizy.com/fantaisie_impromptu_op_66_chopin_sheet_music.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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 5168 bytes
SHA-256: b550d910f9368d7f5125b1f97f9ed587513047cb120d7f6ca3e7c1c200f72b7a
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 10000 bytes
SHA-256: ffbbf5f23758f9a58e6a27e2a8dfb0918aea2b94c204da64cfadce35105f77d5

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