Malicious PDF — malware analysis report

Static analysis result for SHA-256 3046cb7fede2bc7c…

MALICIOUS

PDF

81.6 KB Created: 2021-04-27 02:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18ff15506d76de0e167611b0f8c932da SHA-1: 7428e2de05a2c7b7376439e9390b19afd68a1158 SHA-256: 3046cb7fede2bc7c3ae8b1fb66f6b585867632cdb22345fae0251b529e053b1c
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=dell+7010+sff+review PDF link annotation
    • https://cdn.sqhk.co/vetukalujir/vighdTE/zejobomoji.pdfIn PDF document text
    • http://natur-bio.space/como_hacer_un_solo_archivo_con_varios_documentos3335o.pdfIn PDF document text
    • http://vehicleinsusa.com/54695663198oim5e.pdfIn PDF document text
    • http://health-top.ru/what_is_the_si_unit_of_refractive_indexugdpa.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/69d5e70ad1.pdfIn PDF document text
    • https://vimuzepujox.weebly.com/uploads/1/3/4/3/134368191/dezuten_pejok_fisekatalel_zazobun.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/8heg15p/when_was_the_triple_entente_formed_ww1.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/VGcPDma/xegebiru.pdfIn PDF document text
    • https://sajawibur.weebly.com/uploads/1/3/4/6/134631073/zefaxagiwezamuwawu.pdfIn PDF document text
    • http://badgesverified.com/ny_lottery_abbreviationsfuzlt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f649bc-b713-42a4-bcb0-6ebc37647354/no_excuses_brian_tracy_free_ebook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da51f13c-1254-4859-bc69-939ea7749054/fewekekamope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446ba559-a95e-4bf5-8608-85dc40928485/80545598568.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_af283dbf4c464c44990b18cb3da8f8e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee841d2a-c930-4c93-817b-a3c12084ce6d/gibatamidiluvom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be486305-5ff1-43f7-ace0-e3d2d6e69790/what_jobs_can_you_get_with_international_business_management_degree.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_64b1a1503fe04575b9656726a529eec2.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_2c8fa688d7bd4fb08c505fa9ec38c3a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb2f0ae-6f02-4bb2-9900-b0a103abd380/which_of_the_following_statements_regarding_direct_and_indirect_costs_is_true.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_a3c8f788791141c986095b45b2025d56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/208c9dae-2316-4431-a0d0-1698b16c203b/mustang_owners_club_of_southeastern_michigan.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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 4976 bytes
SHA-256: 582355c8390b97ea5e3dca5cc1095a708281e5a32ee5b8dd23df569dc9efe4a3
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 22300 bytes
SHA-256: 7b777f981adbcd4a3e7842bcd5e17cc4729e44f514e652943c444069833c309b
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16364 bytes
SHA-256: 2f347711b5a8b9d008801a1251b8dd4f08b308ba92f141a078bed8e093c5a8a7