Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff412e3a4d7b31c…

MALICIOUS

PDF

73.1 KB Created: 2021-02-13 12:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1548961455e9aa0cf55e4b23621e7939 SHA-1: b964f224d13747420df0ec14e1733b2dbe34f13f SHA-256: 6ff412e3a4d7b31ce40d8d55bb6433915e610d5a86bbd7d16348f3f26a44e344
126 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, indicating it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting further support its malicious intent.

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://seumenha.ru/wb?keyword=alikiba%20mbio%20new%20song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476432/normal_5ff8872f83c0b.pdfIn PDF document text
    • http://cmb-accueil.com/munchkin_cards_descriptionv7jsx.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/gigcDJk/tiptop_esl_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485012/normal_5fffd750d5af2.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/2937038.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/qibihic/gopifotuwado.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/9f710574b0.pdfIn PDF document text
    • https://zuwulixomelonib.weebly.com/uploads/1/3/4/3/134385653/6dc28.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/hghjtha/risk_benefit_analysis_example_medical_device.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/ggjmgfU/top_cool_ringtones_2019_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/ibpvTgf/motosport_phone_number.pdfIn PDF document text
    • http://grizhoff.ru/307475580611wq18.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/78931765227faa9.pdfIn PDF document text
    • http://robertferrell.net/baaghi_movie_in_isaimini12o29.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/5393139.pdfIn PDF document text
    • http://salestore.pro/messages_neon_icon_aestheticrw7r8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 5196 bytes
SHA-256: a4ef1c825280bf9fa3dc0bfdb9f84228731ea598b63012b23a3033fe33e84638
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 11120 bytes
SHA-256: f3c6cbf06d32b51c6c6376f04e0375d441ca833f912340675caed8f0a0ba5a7f

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