Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4cf9a15f4aee08…

MALICIOUS

PDF

85.3 KB Created: 2021-02-21 03:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac4bd428c25f7d33fb557031ab148cae SHA-1: 232dfb15de1e8745fba20b33e41883310f91ba2d SHA-256: 5f4cf9a15f4aee08ed99106d4bd65a8906da43becc30c04e58caf3dda9ecab91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the 'link farm' heuristic suggest the primary goal is to redirect users to potentially harmful sites.

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://maypoin.ru/strik?utm_term=use+the+fundamental+theorem+of+calculus+to+evaluate+the+definite+integral PDF link annotation
    • https://cdn.sqhk.co/pesenexur/hegiE2e/rebasipisadumazi.pdfIn PDF document text
    • http://wide-mean.top/allahabad_high_court_judgement_ordervr55e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff5ff435491e.pdfIn PDF document text
    • http://lnstagramcentre.net/how_to_make_wolverine_claws_with_paperkwcx6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5ffacd16b35ce.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/fhbghaO/cricket_live_match_score_please.pdfIn PDF document text
    • https://cdn.sqhk.co/ronuwimo/hiigVqz/bavemesipokitikafif.pdfIn PDF document text
    • http://gisejol.iblogger.org/creativity_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/diaifha/63799186834.pdfIn PDF document text
    • http://zuragaretezi.iblogger.org/ashes_cricket_pc_game_apunkagames.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/vMqOica/dragon_king_greataxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_601f8dfdd4dc2.pdfIn PDF document text
    • http://smartcoin.design/rosetta_forner_libros_gratisl5sgg.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/hdheRyx/88788321476.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/netinuwa/77562761033.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/can_you_americas_cardroom_on_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/literatura_genero_dramatico.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/zewibibirawex.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/cf_auto_root_i9300_4._3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 5484 bytes
SHA-256: bab21e0a08363e59742ec4e308ca590835a5edb9e330ac446a16b0a9178496e9
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 11872 bytes
SHA-256: 0efb29770b148c573c13f3774f839d475e6b1ee2c57b8daf523909fffde1440a
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16172 bytes
SHA-256: 2fb24a772c6f667a6587412274ed2d7b668965e3876e61967d9d289e1de4c2db

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