Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aea881b922cf716…

MALICIOUS

PDF

77.3 KB Created: 2021-03-01 11:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a638db332778529e7ea75d3c64ee1e41 SHA-1: 1f639a68f92d8f79cc91d8cf4ad0856b6ad8a7ec SHA-256: 4aea881b922cf716f8c9794a979a54b8c9ea4be5d0afd62560148123f1869ac2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It functions as a link farm, directing users to numerous external websites, one of which is explicitly identified as a disposable hosting link farm. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution 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 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/award?keyword=2015+lexus+rx+350+f+sport+horsepower PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fee464f45551.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/do_you_have_to_bake_a_pound_cake_in_a_bundt_pan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_5fdc7302763d1.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/iiviehb/soponoxet.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_to_see_my_pc_specs_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/pelebitebi/lgfjeih/93813948072.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/SjbbPZB/othello_movie_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawutekoxa.epizy.com/time_and_free_will_henri_bergson.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/wemidusojog.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/quran_arabic_urdu_translation_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/mobufiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/kvalitativ_intervjuguide_eksempel.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/bengali_film_belaseshe_full_movie.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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 5460 bytes
SHA-256: d450869c333d5d7e67df48899c9897fb27672b24a94bf4f4fb005f950b7cba79
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 14544 bytes
SHA-256: 055c61b13ca23c9b9130d7e05642950f9969115536a70c1f98859e94b6def362

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