Malicious PDF — malware analysis report

Static analysis result for SHA-256 806efb1a84761fee…

MALICIOUS

PDF

71.9 KB Created: 2021-01-25 13:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 162d13472ae3d58176787dba64640d9d SHA-1: 76f363da946ce97670ee6b292c81b1378fb51d5a SHA-256: 806efb1a84761fee5a2d501f3a5ea6930408a6d28bc8b4efd4e9ed9d92f1bd61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

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://druttle.ru/123?utm_term=eragon+movie+book+sequel PDF link annotation
    • http://seedcraft.online/seven_letters_one_wordb55t9.pdfIn PDF document text
    • http://xojitufos.66ghz.com/a_knight_s_tale_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/Uuijtic/city_racing_3d_2017_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/wemegofuk/bhhhfRe/angelus_paint_designs.pdfIn PDF document text
    • http://onsideball.info/26218788273fsshv.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/a4liejj/15607541008.pdfIn PDF document text
    • http://zuluwana.iblogger.org/march_for_our_lives_peace_plan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medidadebi.rf.gd/fezowavigod.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/57420960229.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/omnicell_csm_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/lotijud.pdfIn PDF document text
    • http://luwegovufa.epizy.com/afc_fylde_away_ground_guide.pdfIn PDF document text
    • http://kafopazam.epizy.com/8808947062.pdfIn PDF document text
    • http://zevuketeno.rf.gd/cintas_holiday_inn_express_uniforms_2019.pdfIn PDF document text
    • http://mirepili.epizy.com/manual_de_alimentao_saudvel.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/critical_ops_mod_apk_aimbot_latest_version.pdfIn PDF document text
    • http://sidegiri.epizy.com/vigoziga.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/printable_weekly_timesheets_templates.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 5352 bytes
SHA-256: 8fc9055099f7efb77a1dbbc142edadace4ea72d68b2bbcf4943cdeffaaec9ada
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 11800 bytes
SHA-256: da909cf72b4a829e8542aa1129d7f54466f1c4a3b8231f5e8b6f442fa20438ac

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