Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e18e8fab86f28d…

MALICIOUS

PDF

78.5 KB Created: 2021-03-18 07:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3dae53d52a10ff0e6116318f8bf93657 SHA-1: 56cc5863650116c0f42de29df511825441b85e26 SHA-256: 90e18e8fab86f28d6b8ab4ba935542d03c0315d51250a9783f2911db34eb8fc1
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://lozipotod.ru/award?keyword=ship+autopilot+control+system+pdf PDF link annotation
    • https://cdn.sqhk.co/simirides/cgh1hgq/11043599055.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/JIibljb/1283911967.pdfIn PDF document text
    • https://xoxumowuna.weebly.com/uploads/1/3/5/9/135964844/d1be3073b480b.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/04065ea4c288cd.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/belagawav.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/3b76de2b7.pdfIn PDF document text
    • http://zasoremejoka.iblogger.org/fijinuja.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/9c7b2dda2542143.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/1c54a84465aff.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/SWijf3s/p_a_c_full_form_medical.pdfIn PDF document text
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/13e06f3766c0a3.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
    • https://s3.amazonaws.com/nakevoja/75482543866.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/new_gems_english_reader_7_answers.pdfIn PDF document text
    • http://xotilumezimak.rf.gd/zedarosoguz.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/canadian_immigration_form_5257.pdfIn PDF document text
    • http://xibogowidam.epizy.com/jebusuzawegawogikubu.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/78707573602.pdfIn PDF document text
    • http://fevomuvaxubodo.rf.gd/profusion_heat_1500-watt_ceramic_tower_electric_space_heater.pdfIn PDF document text
    • http://mafevela.rf.gd/bulanegomipuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/azerty_clavier_android.pdfIn PDF document text
    • http://lufivav.epizy.com/adobe_reader_x_free_download_for_windows_7.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 5484 bytes
SHA-256: b25f07e6633853576b311c36a768ccd21b3a70be6f145be6a15b5f772e34f07f
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 10292 bytes
SHA-256: 7b6ce0fd34f7000f065341a649c95cec2d9386cb8e469124d8c446b31ee1f673
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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