Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35c8425cce3c433…

MALICIOUS

PDF

72.4 KB Created: 2021-03-18 13:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 864799e58b6fc137c33a5bfdea245db6 SHA-1: eb7091913d54cff6bb420f0bf1abdcd3ea395e6c SHA-256: c35c8425cce3c433d5ede9116a0c48dbe7470ad6233b210612f7a634288ff785
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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/award?keyword=wordly+wise+book+7+lesson+15+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470687/normal_5fef50e0a7cb1.pdfIn PDF document text
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/zibirogutepubekiba.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/9SPjggi/97373712936.pdfIn PDF document text
    • http://ravitidi.22web.org/feasibility_report_on_maize_production_in_nigeria.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/jbBjdV4/dilulorusoz.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/oazQiji/winner_of_cash_days_street_outlaws.pdfIn PDF document text
    • http://rutetasilatigo.iblogger.org/the_magicians_saison_5_wikipedia.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/2304a063a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_604ee50bd7563.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/u3je5Cv/social_media_marketing_planning_software.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/gdwghjh/nazibasujigeganoveruve.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/uhagjjj/75906105819.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/bNpiejh/dogipevesodivujejudizir.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Zijxqlj/vizate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/facebook_news_feed_photoshop_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/pdf_to_word_doc_converter_portable.pdfIn PDF document text
    • http://vonanovab.epizy.com/uc_browser_vpn_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/mental_arithmetic_section_1_test_9_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/tagugokixuxavovuvos.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/esurvey_cad_software_free_with_crack.pdfIn PDF document text
    • http://tafikepuvanotu.epizy.com/automotive_spice_guidelines_1st_edition_2017.pdfIn PDF document text
    • http://xatonidimo.rf.gd/2308719464.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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 5492 bytes
SHA-256: 8f6f0a3e7af4ae665cf1ee654bb3a9ca20f4836fd208fd862a552af67e2ace07
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10768 bytes
SHA-256: 828969a7ed19f4327289510ca56a79b5cf056ec0daa6a901d5e6c0829fb20d46

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