Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b83e2d699461f…

MALICIOUS

PDF

76.7 KB Created: 2021-01-20 21:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 30a7f35296023e4263122c89ec9e2366 SHA-1: 929cc90892f3a7c8cc26aa7da15f30227e15c248 SHA-256: 430b83e2d699461ff981a354518f7394effc1287156080a3b7586dc9e6a18e70
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=karakai+jouzu+no+takagi-san+manga+portugues PDF link annotation
    • https://cdn.sqhk.co/xewimoziwuvo/ggIjhFF/now_you_see_me_2_movie_star_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/gcCifgM/raspberry_lemon_thumbprint_cookies_delish.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/6820562.pdfIn PDF document text
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/bidox-savemekenaduton-piwugasi.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/7icdhhl/heroes_online_battles_magic_and_might_3_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/ujhjbgg/sepule.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/gqVijjy/takowifexanarodijow.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/febopa/lebolapetapuraz.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/ludamen.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/all_sports_channels_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/hack_bitcoin_miner_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/all_new_song_ringtone_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/comparison_between_smart_tv_and_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/civil_service_reviewer_question_and_answer_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/35378275293.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 3872 bytes
SHA-256: 5f051b17b0fe78f0f9def1aed122da3522f67e8ed16cd996347663335a8459cf
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 5300 bytes
SHA-256: f14079b1ea45d6abb280c46e0fee13048b01fb997fbcb32db3e86912cd134178
font_02_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 11156 bytes
SHA-256: e44f6aa0fde7aa0cab205fd61cd848d015516cd51ce10a3447422a5ef8963fa8

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