Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c913b02d834df2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-07 17:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7395cad0ca3d8ce0dad8455216488c78 SHA-1: 311d20c115fb688aa31813494bd38634d1271fa3 SHA-256: 87c913b02d834df249b00ca579a704f368602c5d71602bc0cb35a5a7086262da
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 0.9997

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://dafemum.ru/123?utm_term=who+are+the+big+3+greek+gods PDF link annotation
    • https://cdn.sqhk.co/duxadikoti/EjghinY/41045010092.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/gjHjfP7/fibetiwamanutikusimexiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ghoiahd/gikasofezumoranogaf.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/gGhithh/mancala_board_dimensions.pdfIn PDF document text
    • http://topcreditreport.info/alex_rider_scorpia_chapter_summary4i19b.pdfIn PDF document text
    • https://tisivuvuzudopur.weebly.com/uploads/1/3/0/7/130738638/5c616752.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/ken_wilber_spiral_dynamics.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/jjihqZS/fantasy_tower_defence_3d_hacked.pdfIn PDF document text
    • http://bonusiotsbera.online/upsc_all_books_in_hindi_downloadydrc0.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/sanorusobovamumaxivavuz.pdfIn PDF document text
    • http://springwin.space/boomwhacker_play_along4o7ny.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/jhBjf6F/fotugapodikugijudupuz.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/9c171f51b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://batapijas.myartsonline.com/81955584857.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/mirubebamarojekep.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/lawul.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/12022957033.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/6674140210.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/aa_zoom_meetings_raleigh_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/the_filmmakers_handbook_fourth_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5436 bytes
SHA-256: e9109a4957d3a8cc2481cf535d9b345173c04fa3b09f41e22b29bf57d6fcc0f7
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10708 bytes
SHA-256: a61a234d019ea5be5be55c26f663dbcd8ab1c9897f28b121110db057f69e52f0