Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4c26de78c4d7a1…

MALICIOUS

PDF

84.0 KB Created: 2021-06-05 23:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7f2b74fb4c46e0599edcab613970dea4 SHA-1: a424c68bdd9f2c0e3e4356ddffca24298a46012d SHA-256: df4c26de78c4d7a17adeb7e3d15419dfad27fa285b26623c4d43296cbc1e947e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/pbw?utm_term=exercicios+concordancia+nominal+7o+ano+com+gabarito PDF link annotation
    • https://zerevodajerut.weebly.com/uploads/1/3/4/5/134502997/togexukelemugum.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/pebopawa.pdfIn PDF document text
    • https://pudexaxetodeli.weebly.com/uploads/1/3/2/6/132683251/b0c603.pdfIn PDF document text
    • https://sevizigetumopib.weebly.com/uploads/1/3/4/0/134042829/dcd50a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/product_warranty_letter_format_sample.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/f/anatomia_y_fisiologia_de_tortora_gratis.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/on_the_guard_ymca_lifeguard_manual.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/diseo_de_maquinaria_norton_4_edicion_gratis.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/muxemajiwesewafuximexig.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/21860603455.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/evergreen_speedway_tv_schedule.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/skyrim_can_you_become_vampire_lord_again.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/f/81265467779.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/how_to_print_multiple_slides_on_one_page_macbook.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/what_is_the_boiling_point_of_element_113.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/is_nbc_sports_gold_on_roku.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412455/zurudexuvekivojodimone.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144414783/real_book_bass_clef_free.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/w/file/fetch/144458277/nuwazebosed.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144528396/43595250593.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/f/ios_10_beta_software_profile_download.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/when_a_sagittarius_man_misses_you.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144581568/lg_ductless_mini_split_systems_troubleshooting.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/rutamodexuduxesuda.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 5504 bytes
SHA-256: 948d3448cbbce9f3e453aa7e3b92b1446a3bc7eefa8658a59a2d150d9922ceb9
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 13016 bytes
SHA-256: 2b2ce45e61b4a750213e5e437b335421842dd0defb6fc9e7a94337e9ebacc608
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90