Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fd41c18a66cc23…

MALICIOUS

PDF

93.2 KB Created: 2021-05-03 17:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad70baae71700e11b5e056371abce2d2 SHA-1: b8b1db7bb998f8b0858e893b73dc4e7da8b361bc SHA-256: 91fd41c18a66cc2318a8d4e30a5d0c733d0788ce2fec623ebe10d72fedff3d3e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'golowaki.ru' which appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'star citizen free 2021', suggesting a lure to attract users to potentially malicious content.

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://golowaki.ru/strik?utm_term=is+star+citizen+free+2021
    • http://dizurexemubegog.mygamesonline.org/oasis_water_cooler_faucet_parts.pdf
    • http://homeolimp.com/82910290415aztzm.pdf
    • https://cdn-cms.f-static.net/uploads/4393349/normal_60697edb25485.pdf
    • http://tesocoin.online/40410367694917k.pdf
    • http://vuwiwetidajin.mywebcommunity.org/baronne_staffe_usages_du_monde.pdf
    • http://neriwor.medianewsonline.com/penyebab_bronkopneumonia_pada_anak.pdf
    • https://cdn-cms.f-static.net/uploads/4443598/normal_603924f658d81.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_605ce7ddd691e.pdf
    • http://ralugugifoxatir.scienceontheweb.net/distillation_column_design_calculation.pdf
    • http://medebupima.sportsontheweb.net/50184186864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_dedddc03c8c64fa486a03e39cc2f9b88.pdf?index=true
    • https://s3.amazonaws.com/bubodeliza/kemuropet.pdf
    • https://s3.amazonaws.com/lebejos/chinese_ghost_story_game_english_version.pdf
    • http://jajoxutevo.epizy.com/calligraphy_writing_fonts_free.pdf
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_353d138591524a81ae6750c10d3ffd4b.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_0c56add3eb4c4769b417f9ca62aeebbf.pdf?index=true
    • http://devimetoto.epizy.com/79576924299.pdf
    • https://s3.amazonaws.com/dazovosugev/nazomesijuzetupimogogesok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013026.bin
e4c0a226944d6a5c8fbe48cc8af7c058b0bf6ffa4dda44aafbc5803c02f1fd1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 5156 bytes
font_01_sfnt_off000141ca.bin
f65a86a22a3b0c0195de4336448dd3b941183618e695679704074a73a05ff7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141CA 11236 bytes

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