Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9b2acb879e58dd…

MALICIOUS

PDF

87.5 KB Created: 2021-03-28 18:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 017478cdbfa28c4c8820f07c81a0fadb SHA-1: f3c73e810036568aa042eed85104af15fab07485 SHA-256: 5f9b2acb879e58dd6508101664e99c7fc9a1f92132aeabd8a96b1d1400016294
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 0.9989

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://pelibifir.ru/strik?utm_term=resucit%25C3%25B3+cantos+del+camino+neocatecumenal+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/givukugitewe/0A92Tif/37128118037.pdfIn PDF document text
    • http://wwbook.org/suzuki_cello_book_2tato7.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/jMghnhe/bake_it_better_books.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/fkjcjiF/download_spider_stickman_fighting_supreme_warriors_mod_apk.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/what_is_the_smallest_city_in_the_world.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/gaxisulazisanu.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/33873932593.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/cXibgj5/emergency_calls_only.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/60838371911.pdfIn PDF document text
    • http://magic-world.site/5731342106yu4pb.pdfIn PDF document text
    • http://reliables.ru/yamaha_rx-v373_receiver_manualloj82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_d50459bfd1bd4aa7a21f4e3c4eea01ac.pdf?index=trueIn PDF document text
    • http://zezajezo.epizy.com/how_to_reset_a_honeywell_visionpro_thermostat.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_1534e62d1ca3437e886b7119046411f7.pdf?index=trueIn PDF document text
    • http://toxawilel.epizy.com/94117540618.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/hernia_umbilikus.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/company_director_stamp_format.pdfIn PDF document text
    • http://gobiburitumeri.epizy.com/design_of_aerostatic_bearings.pdfIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_3601bc9efda445d9af361a512cf8a4d7.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_1d74174067f448e887b479cfe2b81adf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/joyous_celebration_gospel_music_free_s.pdfIn PDF document text
    • http://fumibomi.epizy.com/subchondral_cyst_formation_shoulder.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/rutabupa.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/2126909938.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_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 5620 bytes
SHA-256: 194b3ea8de578932a2bcb6d92fc2a88114508777352e7ccc602972a71d44166d
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 12304 bytes
SHA-256: 903d89035833f84b1e7dae25dc9ba4557358f3bc857a57478bc78247306fa277
font_02_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146