Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eb1b3288603087…

MALICIOUS

PDF

72.0 KB Created: 2021-03-01 21:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cfee906105f041f1ff283909a6b9c93e SHA-1: c357f5f73c826f7680ea749c76dd070821316564 SHA-256: 73eb1b32886030876b4d26f16c744f5922bfd87b9db74a6a100972abda4a5751
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malicious redirection scheme. The PDF's structure and embedded URIs indicate it's designed to direct users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/wix?keyword=2020+ncaa+basketball+player+rankings PDF link annotation
    • http://peteferix.mypressonline.com/what_intermolecular_forces_are_present_in_hydrochloric_acid_hcl.pdfIn PDF document text
    • http://ueuniti.website/469120522715bgki.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/57947858208.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/widumumezalatipilutixid.pdfIn PDF document text
    • http://axecheat9.xyz/kafogebojutenothy4r6.pdfIn PDF document text
    • http://triple-doska6.club/free_html_templates_for_email_campaignsfbgyb.pdfIn PDF document text
    • http://5dradio.ru/how_to_contact_seller_on_facebook_marketplacef1xwf.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/jbVaic4/jokukokudajenagam.pdfIn PDF document text
    • http://byt-upak.ru/pokemon_revolution_online_suspicious_botllrgu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivenoke.onlinewebshop.net/resumen_del_libro_el_jardin_secreto_rincon_del_vago.pdfIn PDF document text
    • http://gevuraragide.rf.gd/41612391099.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/bitumen_corrugated_roofing_sheets_wickes.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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 5584 bytes
SHA-256: 9707dac42866fada2e0a60b23a2efa2e6aeb47e230805ee90622a9f8c3b3b9d8
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10360 bytes
SHA-256: 84f852fe4c8567f62bc649c642407e8ea87c04425b910ee68ce4bc87b5ab48ed

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