Malicious PDF — malware analysis report

Static analysis result for SHA-256 4daddda9407210bd…

MALICIOUS

PDF

68.7 KB Created: 2021-02-20 21:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 13e86a1bb243109bde86b2928a87dee1 SHA-1: ec097a51a3049814abd31a5c0e88b62ebc7e9228 SHA-256: 4daddda9407210bdd4d55dccab4e2458777d16e6abdb599feb5b08ed03be2ad7
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://jottigo.ru/strik?utm_term=what+is+the+best+sat+prep+app PDF link annotation
    • https://cdn.sqhk.co/dakagugi/eJhi8cK/free_printable_online_grocery_list_maker.pdfIn PDF document text
    • http://tekijanimawov.22web.org/tejapomaxanav.pdfIn PDF document text
    • http://womans30planet.com/comment_afficher_les_formules_sur_exceldyjxg.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/Juc2jc9/84570944626.pdfIn PDF document text
    • http://drovazvenigorod.ru/non_chronological_report_writing_checklist_ks2d5sxd.pdfIn PDF document text
    • http://mon-cmb.best/62805228573gkqj5.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/juvetaso/valentine_s_day_movie_free_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/vubagobemiren.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/are_automatic_or_manual_cars_cheaper.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/24365545730.pdfIn PDF document text
    • http://nanisoz.epizy.com/esl_feelings_vocabulary_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/dante_s_inferno_john_ciardi.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 5028 bytes
SHA-256: fe5ff43fc7bf426eacc20f7997df1e9592a50ab54886707eafa6c1212b3d9ac5
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 9332 bytes
SHA-256: f97688b08338cbbb2107f36b22cabbb6dcd6ec48a21c10e737b85b55bdea4d0f

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