Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ddde2126c198ba…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 15:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bac7d6a5de205d8a85d38c0d2a642953 SHA-1: 3240526cca1546392ed56b8762eeeade58b30d2d SHA-256: 92ddde2126c198bae80f13e18d1b48d05be27fe9fd7d0191c5293f1aa7ed5749
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily garbled, suggests a lure related to 'combinatorial analysis'. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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://jumiwimov.ru/award?keyword=introdu%25C3%25A7%25C3%25A3o+%25C3%25A0+an%25C3%25A1lise+combinat%25C3%25B3ria+jos%25C3%25A9+plinio+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6021c4a2c71cc.pdfIn PDF document text
    • http://wirufebo.22web.org/extraordinary_popular_delusions_and_the_madness_of_crowds_drive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_602426f012f93.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/how_to_clean_a_george_foreman_outdoor_electric_grill.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/add_text_to_linux.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/gustavo_adolfo_becquer_leyendas_y_rimas.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/sumojuxasorojasezumalugev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6014c3da4608a.pdfIn PDF document text
    • http://pegiwikepideke.iblogger.org/92172112547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renodiwug.epizy.com/what_do_enfps_find_attractive.pdfIn PDF document text
    • http://begukisar.epizy.com/89493134452.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/is_there_a_harry_potter_ps4_game.pdfIn PDF document text
    • http://kujazidi.epizy.com/coleman_powermate_6250_carburetor_cleaning.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/32344698735.pdfIn PDF document text
    • http://lufivav.epizy.com/18455646296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4948c01-3450-42db-97c2-6093c722b43f/how_to_use_netgear_powerline_1200.pdfIn PDF document text
    • http://kikujebi.epizy.com/bumblebee_transformer_toy_near_me.pdfIn PDF document text
    • http://girofili.myartsonline.com/20360074302.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/i_like_me_better_musicpleer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920ac452-eb82-460e-88bd-d1c9af610b81/tuzoduxesamemipidami.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_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 6700 bytes
SHA-256: b914b54aa2f40e7030dbdb1eb41a19295f25b0239b6f719d240854a5ab58c0ad
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 11676 bytes
SHA-256: 707cd731bada8897647e3150be7deec36816c33a55771d705838408e1e6a55dd

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