Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c5550ae47556c7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-09 07:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6a5fe326cbbc476c98c6f3920d0c721 SHA-1: 5f8c9d0ffc6e04cbb8440847bb8f35c559aa55a4 SHA-256: 97c5550ae47556c7493bcbbd3a8087e00bba3a31b4eb8497f51c8cc8d4d81232
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 0.9998

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://midufefew.ru/award?keyword=chess+puzzles+mate+in+2+pdf PDF link annotation
    • http://fezatubiwe.getenjoyment.net/mclane_edger_3.5hp_for_sale.pdfIn PDF document text
    • http://ryukzak.digital/how_to_soften_jelly_beans2ayug.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/sipeletaserokewuteti.pdfIn PDF document text
    • http://covid-19online.site/16053412669mhuzn.pdfIn PDF document text
    • http://eurozone.pro/mastery_greene_summaryelz2e.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/masters_of_doom_tv_show_cast.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/how_to_fix_a_hoverboard_that_wont_turn_on.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/19144917037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_9b432fd4e5c145ffa127af01499be66e.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_2798ec3d6ce949bbba3cb5448f61e319.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/9758948816.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/chick_fil_a_chicken_salad_nutritional_information.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/singer_simple_sewing_machine_bobbin_issues.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_150d360331514c85bd30dc1536c19e3a.pdf?index=trueIn PDF document text
    • http://jivixolijenirew.rf.gd/scanner_bosch_obd_1150.pdfIn PDF document text
    • http://vonolukover.epizy.com/drivers_canon_mp250_para_windows_10.pdfIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_d8745dbdf87f43d9a2a33b9f7e02fefa.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5272 bytes
SHA-256: 89b3ef9c764cf22215778a0c6bbb839e81d607bfee7a3c06606610bca5ad85a4
font_01_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 10288 bytes
SHA-256: a0031b20abccc080e400393e4290920248d0a68c875dfa8444fe9705980b2864

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