Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73ed6e4b02128e2…

MALICIOUS

PDF

83.6 KB Created: 2021-03-23 03:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fae544d5a69d8ccd8500700f877a298e SHA-1: 71f2952dad0ee32094808cbb25163562cd8a8a5d SHA-256: e73ed6e4b02128e25de485e7409e239af912757adbf02f8178df78bf5af2fc6e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, including one identified as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://resalured.ru/award?keyword=applications+of+aldol+condensation+pdf PDF link annotation
    • http://healthyforczechrepublic.site/the_spectacular_now_ending_sceneetf2h.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/namidatoko.pdfIn PDF document text
    • http://jefexon.22web.org/fijemufubudisopotiwexabef.pdfIn PDF document text
    • https://mewemevo.weebly.com/uploads/1/3/1/4/131454270/kosixepafivil-kotuderabi.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/9314854.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/tiwitut.pdfIn PDF document text
    • https://gigexozokup.weebly.com/uploads/1/3/2/6/132695408/1537010.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/is_the_four_agreements_a_christian_book.pdfIn PDF document text
    • http://zaxunux.iblogger.org/86864545906.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/vuxafokumenawonaliduzzfux8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00da4a5-6906-4e27-b474-2a9cd320e596/tipogu.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/gabebobijujabudexefim.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/free_editable_engagement_invitation_templates_india.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/who_played_the_elephant_man_in_the_original_movie.pdfIn PDF document text
    • http://ruraruke.epizy.com/55353266018.pdfIn PDF document text
    • http://mimosomudex.rf.gd/garmin_gtn_750xi_simulator.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/strengths_and_weaknesses_interview_answers_for_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621ec574-0446-43e7-b1fc-c528f11b9609/what_size_coffee_does_dunkin_donuts_have.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/shelf_wallpaper_for_android.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_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 5040 bytes
SHA-256: 77f0cc27c66705aff3e6f7f6334302c7d0808a7e755b26929e27600dfcd37868
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 12484 bytes
SHA-256: 6a902cd042bee127af61c9b62c1b1883d359dc91bff031c3c36127ee21b4b92b

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