Malicious PDF — malware analysis report

Static analysis result for SHA-256 c440941e3d1be7f2…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 13:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd71f4a5530cb6fc9d7086928fe04fc2 SHA-1: 7282a0615245a3c1146e349e6526fb19891c0572 SHA-256: c440941e3d1be7f2423fed2c98e84029c1a56989aa908769638b2d7a0db381cc
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://bologen.ru/123?utm_term=how+to+tune+a+cobra+29 PDF link annotation
    • http://helplnstagramcontact6088758.com/xv2_mods_installer_downloadfcjnq.pdfIn PDF document text
    • http://sparzha.club/46950315761j4jjo.pdfIn PDF document text
    • http://4bochki.ru/accu_chek_erro_e59ir5c.pdfIn PDF document text
    • http://glossywp.online/rp_girl_scout_hymn_lyrics9ge8k.pdfIn PDF document text
    • http://mexicotop.xyz/365960517326w0hg.pdfIn PDF document text
    • http://frasqen.online/read_crescendo_online_freewzawy.pdfIn PDF document text
    • http://mmmmmme.space/carrom_pool_hack_filen08xd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_601537c7a37be.pdfIn PDF document text
    • http://stavki-na-sport.site/bewakudulibitizulvzt8.pdfIn PDF document text
    • http://cg-designer.xyz/bhaijaan_elo_re_kolkata_full_movie8rif2.pdfIn PDF document text
    • http://info-pages.ru/how_to_use_a_singer_hand_crank_sewing_machinezfuxv.pdfIn PDF document text
    • http://vovality.club/jovutuserukivawujafex0g1ha.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/gdhaDje/lucky_block_mod_minecraft_1._8._9.pdfIn PDF document text
    • http://mscredit.info/european_basketball_tournament_2019yca8h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remufuzu/ethiopian_reporter_newspaper_job_vacancy_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/dodemiki.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/46495696072.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5064 bytes
SHA-256: 6b0f47326aca47a2196967d1d0c870c30149fc46646c8380e74cbe22364769be
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 10768 bytes
SHA-256: fd6019ad2260e6c76f95fb0587748a508dd030c92b1931cf5a8789b8950d8233