Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92459b35788a8ed…

MALICIOUS

PDF

82.4 KB Created: 2021-03-08 23:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d853359deb6bb7071234e095b05d653 SHA-1: 9dd12e1500ab8791fa3452dcb289bd6bf07e5c15 SHA-256: c92459b35788a8eda5aa6cc9b4ec02f4be325d94bab554dee8e3b4266442429c
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 0.9985

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://zajinet.ru/wix?keyword=chemistry+post+lab+answers PDF link annotation
    • https://cdn.sqhk.co/naxokujim/r5Xjiij/5948580879.pdfIn PDF document text
    • http://solent.bar/xakubunifupof0f1w.pdfIn PDF document text
    • http://aazzzry.space/candy_crush_soda_saga_for_pc_free_download1ntil.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/more_effective_c_download.pdfIn PDF document text
    • http://natnat.fun/gamixotanerijivafabezokjvd2z.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/ejhvghi/celestial_orbit_definition_astronomy.pdfIn PDF document text
    • http://italywom.space/606734491909etu.pdfIn PDF document text
    • http://mipefukonuvav.iblogger.org/good_witch_season_4_episode_10.pdfIn PDF document text
    • http://wubufenubasog.iblogger.org/wards_signature_sewing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/ciaiiij/48380596224.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/hiaDTQj/donoxasulekabetutoveku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lomizawok.epizy.com/riderakuzozu.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/learn_german_online.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/27034612246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6496596-5ded-4e92-a716-eaf444ae422f/the_valley_of_horses.pdfIn PDF document text
    • http://filazit.epizy.com/which_moment_corresponds_to_the_minimum_kinetic_energy_of_the_system_chegg.pdfIn PDF document text
    • http://mevonaku.rf.gd/2004_polaris_predator_500_repair_manual.pdfIn PDF document text
    • http://duwagisu.epizy.com/snow_white_halloween_costume_makeup.pdfIn PDF document text
    • http://xajizufobuvofo.epizy.com/expanding_sentences_worksheets_1st_grade.pdfIn PDF document text
    • http://fobunedofakane.rf.gd/vutisuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69059ab9-a0ac-4bc8-8c11-09d3827d63b3/61143636429.pdfIn PDF document text
    • http://jijawidifopaw.epizy.com/dokuduluzitixaw.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/how_to_make_spreadsheet_read_only_2013.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 5204 bytes
SHA-256: 399d2a9a759fa3cea5e6c542f95f80400c681859ac58641bf0325f0fae552ae7
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 10484 bytes
SHA-256: 62a9e7ee956e488d3e116af4e9d0112e387e725ae32e8b710788b0b9a712744a
font_03_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71