Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb3c63082c6b445…

MALICIOUS

PDF

70.5 KB Created: 2021-02-28 21:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 15a8c4c2c313c0162ffe662b9e35da7e SHA-1: e37796a2962347f3ae3811fcc2cc4a6e2303a455 SHA-256: fcb3c63082c6b4450e52c56027be14e7f75cdfd0164456e5196894f515a29bb0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=how+to+visualize+in+your+mind PDF link annotation
    • https://cdn.sqhk.co/vizakifito/Ivy6idi/3m_post_it_flags_sign_here.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/XqQglyW/83884090493.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/fMgfjcU/esta_fundido_en_ingles.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/qibrjaI/real_pads_become_a_dj_of_drum_pads.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/new_yorker_magazine_december_14_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/ngcngdH/ted_lasso_trailer_deutsch.pdfIn PDF document text
    • https://kazugimopizefew.weebly.com/uploads/1/3/1/4/131406381/7acebc.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/XB0vW00/70691028796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurevetafajes.epizy.com/55709382087.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/1021924023.pdfIn PDF document text
    • http://redusaboj.epizy.com/kundi_much_song_video.pdfIn PDF document text
    • http://fituxulilofe.epizy.com/harley_quinn_movie_free.pdfIn PDF document text
    • http://gejevebo.epizy.com/papafusige.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/negemi.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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 5236 bytes
SHA-256: eda36abc3d552276cfbe940c6ba52f3d19187b15db23aa935dbe96e79641f8f5
font_01_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 10420 bytes
SHA-256: 2af1234cc99c3f9deab915e1cbb40bd273a3e67f89b3083fdf7ac0b8a19dcff0

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