Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab435fe800bb752…

MALICIOUS

PDF

75.2 KB Created: 2021-02-25 10:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b798736d10d53a82f9ae9bd9027e4101 SHA-1: ebd0079e4caa5777905814fe336ae071d0d21cc0 SHA-256: 9ab435fe800bb7520369767833142a88c97ef67f140c93b91319ce1d381be682
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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
  • 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://leonvi.ru/123?utm_term=is+blender+completely+free PDF link annotation
    • http://bawukafivawi.iblogger.org/what_are_some_major_problems_with_the_american_education_system.pdfIn PDF document text
    • http://select-get.top/75463087721spxkg.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/9sW9TIQ/dance_80_s_music_disco_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/pieGhdj/sitiwazosox.pdfIn PDF document text
    • http://dompodklyuch.com/formato_cuentas_t_para_imprimir1iyyj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6026c11e6aa12.pdfIn PDF document text
    • http://vnds-super.space/658801759422fn5p.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/aashiqui_2_tamil_full_movie_mp4.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/jelutu_bawitomi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/fgeQji7/34274827952.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/KihHhc6/hunting_bow_black_friday_sale.pdfIn PDF document text
    • http://boputev.66ghz.com/jopotekanizevunasani.pdfIn PDF document text
    • http://axecheat8.xyz/madulixasxxjo2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sizabo/ccrn_review_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/nixexuzujubaruvadoxega.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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 5272 bytes
SHA-256: 503c87a0b533d3665020932aa59603677bc8fbc3bd7a7f9f7e316972e4857975
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 10720 bytes
SHA-256: a7aabed1c5a5cf34826b96b07ac0a60f20fc1f55e10bfe07e038e99a35fdf3eb

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