Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ed5c8b92c6ae67…

MALICIOUS

PDF

90.3 KB Created: 2021-02-25 10:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 681b834c7282263030bf833f89fd87a8 SHA-1: 8df82381e88e4f44d9e8d784b76801770736e3e8 SHA-256: 94ed5c8b92c6ae675693063f70a5008578bc10f8b74362de2a63a3d85347a195
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=autocad+3d+tutorial+ppt PDF link annotation
    • https://cdn.sqhk.co/xetokive/ehcKieR/18688369982.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/DuH8Mje/cooking_fever_cheats_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/XuTtgh3/mesujazumoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/hijjtGD/93212983851.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/haWjcgg/dipaxosivolafixopegexu.pdfIn PDF document text
    • https://mazekijaxok.weebly.com/uploads/1/3/1/4/131453602/tajuxilajawiduz-kesebuwow-sobipibivesuj-sosusokoza.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/kutago-tugaweku-xiwimiwo-lutikuzomawenit.pdfIn PDF document text
    • https://cdn.sqhk.co/wapevenupu/dngd1jh/19098399406.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/mogenixafopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faduzidivatakid.epizy.com/21280300852.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/how_to_descale_nespresso_lattissima_plus_machine.pdfIn PDF document text
    • http://kesekerezox.epizy.com/california_driver_handbook_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/komefirufonug.pdfIn PDF document text
    • http://lituvatitibew.epizy.com/xizixukifikewobofuze.pdfIn PDF document text
    • http://fufezexu.epizy.com/tezebu.pdfIn PDF document text
    • http://jelenexej.rf.gd/paleruriz.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/34674211901.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/add_email_signature_outlook_android.pdfIn PDF document text
    • http://kisolapuri.rf.gd/spider_man_homecoming_movie_in_filmyzilla.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/jixekuvojikaz.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_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 5040 bytes
SHA-256: 909af72f9851059dca824494a01d906c989969c676029bef395636ea758fdea5
font_01_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 10616 bytes
SHA-256: e64b6766e417e383c0235886969ee7114faca5f46198a2e50780b0e062f4f735

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