Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f55b368c10505b1…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 04:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a2d047d8e71abfd6669e3680a3099051 SHA-1: fcee157e1f8f11631a6777af5bd9122f7487f4da SHA-256: 3f55b368c10505b18d96599d664a7906d270b1f3d5985287414d9373bad0a55a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains and potentially malicious content, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate effort to create a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/award?keyword=built+up+section+pdf PDF link annotation
    • http://xidasetetobuge.scienceontheweb.net/maths_surface_area_and_volume_formulas.pdfIn PDF document text
    • http://marketeuro.pro/157063498846wvsa.pdfIn PDF document text
    • http://goodsun.space/xisavuvotevpj187.pdfIn PDF document text
    • http://miravatiz.22web.org/centripetal_force_lab_answer_key.pdfIn PDF document text
    • http://zuwukinir.iblogger.org/basic_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_60381c448d91a.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/14836081576.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/kawuruzipalixidi.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/97289611063.pdfIn PDF document text
    • http://item-get.top/social_media_marketing_for_business_2020_book0un9m.pdfIn PDF document text
    • http://summ-ita.space/niwerc8k0r.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/mega_stream_tv_app.pdfIn PDF document text
    • http://ziduruwekomowob.iblogger.org/tewabawowow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_603a99523685b.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/samsung_c460_waste_toner_replace2jn8g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vodemenuja.epizy.com/los_sueos_de_helena_eduardo_galeano_descargar.pdfIn PDF document text
    • http://xoxatejapulaj.epizy.com/pdf_compressor_mac_software.pdfIn PDF document text
    • http://janarisugikev.rf.gd/26208205182.pdfIn PDF document text
    • http://ropiviteginu.rf.gd/fuwosofaron.pdfIn PDF document text
    • http://koxosam.rf.gd/poxopekagusajelubojuveseb.pdfIn PDF document text
    • http://bategozejaxa.rf.gd/how_to_factory_reset_hp_p1606dn_printer.pdfIn PDF document text
    • http://papilumovojulez.epizy.com/lavozuxozipeliwa.pdfIn PDF document text
    • http://valumaj.epizy.com/the_life-changing_magic_of_tidying_up_the_japanese_art_of_decluttering_and_organizing.pdfIn PDF document text
    • http://vufositediv.epizy.com/bedford_reader_chapter_6.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_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 4892 bytes
SHA-256: f8a64421b98afb83c9a1614326efb1c0a26eaedd2eb65c2c6cdfb45637c4980e
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 10668 bytes
SHA-256: 765cbe0ca9bab15aa4061e7dc8a37c148df43e75ec59a35bd7972d556e77f53e

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