Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d974791ea749e7…

MALICIOUS

PDF

77.8 KB Created: 2021-04-15 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 92ee05e276a028e0b971d00514d90b87 SHA-1: 7037f80879d12eb371f141427998365fc506abca SHA-256: 70d974791ea749e7fe5ea46666e3d9df9b4cf42bdfd3f2723c934cdb645ecaf4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically highlighted as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Black's law dictionary', aiming to trick users into clicking the malicious link.

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://jacksth.ru/strik?utm_term=black%2527s+law+dictionary+10th+ed+pdf PDF link annotation
    • http://gugelomem.22web.org/17649008957.pdfIn PDF document text
    • http://rotelebi.22web.org/when_my_brother_was_an_aztec_by_natalie_diaz.pdfIn PDF document text
    • http://nonukel.iblogger.org/dezetegojowekovu.pdfIn PDF document text
    • http://sumavefomomag.22web.org/wings_of_fire_full_book_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befonixepar.rf.gd/how_to_plot_simple_graph_in_mathematica.pdfIn PDF document text
    • http://redadut.epizy.com/value_of_gas_constant_r_in_english_units.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_f103f0785cfb4198bba8f9369756ed48.pdf?index=trueIn PDF document text
    • http://kixoduw.epizy.com/trimble_s6_firmware.pdfIn PDF document text
    • http://vutegug.epizy.com/rijoge.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_cfb2679dd4e54122b5f6eccc72b084b4.pdf?index=trueIn PDF document text
    • http://timawerana.epizy.com/xuvivu.pdfIn PDF document text
    • http://devagejoga.rf.gd/exorcism_of_anneliese_michel_book.pdfIn PDF document text
    • http://vetetipusel.rf.gd/bullet_strike_battlegrounds_mod_apk_free.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_38eed3ba8c844c63b6e2646365bb9e18.pdf?index=trueIn PDF document text
    • http://mowiredeponup.rf.gd/60700339291.pdfIn PDF document text
    • http://lapumugafo.rf.gd/54224632407.pdfIn PDF document text
    • http://mirepili.epizy.com/intercept_x_advanced_for_server_datasheet.pdfIn PDF document text
    • http://tekubawo.epizy.com/life_and_death_download_free.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_63c04b157dcc4fa3ab35d76a91c9d40f.pdf?index=trueIn 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_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 5776 bytes
SHA-256: d02b73f8c4d33c481d683ec1183b8fa0b6c1696534ebe6fe845a5d7038277a54
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 12440 bytes
SHA-256: 419f1bde542f0491ee07a6585f05cc7e824d72fd8ea0ad9c52227b04ea7f60de

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