Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1bbc76b365ff29…

MALICIOUS

PDF

62.9 KB Created: 2021-02-17 14:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1eeaad2d90688e59ecd1a7a28efa55a6 SHA-1: 9730a429f3c0c8811e90975b8066c89b9dd0539c SHA-256: 3c1bbc76b365ff297283053fb0107e8d3cee5c0e2946f211ef2574e94db035a8
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://bologen.ru/123?utm_term=brunner+%2526+suddarth%2527s+textbook+of+medical-surgical+nursing+13th+edition PDF link annotation
    • http://yewes.space/vidmate_2018_app_videosxfx7.pdfIn PDF document text
    • http://alexandreablog.com/proton_bus_simulator_2020_descargar_pc27j88.pdfIn PDF document text
    • http://1offpark.xyz/mimevexoki5bw9z.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidatoxo/XgcOiaq/12576536142.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/gienigE/classic_slots_vegas_free_coins.pdfIn PDF document text
    • http://arendaavto.taxi/586756345524d20c.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/pelodasoziviboddt6ly.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/djfFRz0/fab_mobile_number_change.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6002df1507903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_6025057d9e4a0.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/iijj5hf/pastel_rainbow_tie_dye_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_602c2dcf311de.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/jcid1kV/catfish_cooley_wife_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/fij59q6/mimixijivak.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/ichdlih/boss_punch_bowl.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/bib6Lgf/totopos_cary_nc_specials.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 4304 bytes
SHA-256: 62aaed034e4627714dff5a79b9c671c297ec4dd53bf499718c9e41be62472eb7
font_01_sfnt_off0000ce0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 9612 bytes
SHA-256: 23dd1835de33cfc27357e64fd861e5438b51febde9530257892c59cce9ef507b

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