Malicious PDF — malware analysis report

Static analysis result for SHA-256 8878e5b99386e3ed…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 22:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d492be5dd1a6a30d1d6ea79acc9c01be SHA-1: 58fa01c9e2a7232414b3c8728a58ce96caab120d SHA-256: 8878e5b99386e3edfa65ce5f09a1d905d6c3f0d4cd7d83b797b57c31d99e2a5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=college+recommendation+letter+from+employer+template PDF link annotation
    • http://bbcua.site/kenanpnbx9.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gfhfiI8/felezukopuzazutoj.pdfIn PDF document text
    • http://wow50.pro/honeywell_1300g-2usb_barcode_scanner_manualern7l.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/94270387522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_602fd5882925a.pdfIn PDF document text
    • http://lasleymarkt.ru/fagegojojuuo785.pdfIn PDF document text
    • https://cdn.sqhk.co/taviboku/hXheiaG/zodifukedetuzedivukonu.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/77379764293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_6041fe1d18094.pdfIn PDF document text
    • http://svoylend.xyz/blue_window_play_scriptk9lxb.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/oygdghg/23403541697.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/madenitemuk.pdfIn PDF document text
    • http://naturmilans.fun/binkw32._dll_windows_8m15gf.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/encphalomylite_aigu_dissmine.pdfIn PDF document text
    • http://lamovingcompany.com/ruger_1022_parts_diagramv70pl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5fe759d8e9712.pdfIn PDF document text
    • http://mediaverifiedbadge.com/ladorj0c39.pdfIn PDF document text
    • http://servempieza.site/minn_kota_terrova_80_us2_trolling_motor_w_i-pilot__bluetootho15jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_602d46fff1fea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudugapapilile.atwebpages.com/exercises_verb_to_be_present_simple.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_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 5304 bytes
SHA-256: 8d1efa2c8e325484682cdc6c8ff9d5a10eef32ff1377bf9d56bf88cffb30a04b
font_01_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 11144 bytes
SHA-256: 5e517f3636a7a13d9355bf0428708dbf334b0b7ec8c1fcbea75817e7a71bc3dc

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