Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd233e2733a7f4…

MALICIOUS

PDF

92.5 KB Created: 2021-02-12 07:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02a80062bbd2881c58859d630f9b3dc2 SHA-1: a3f471a20ee7cbdbf6d276feca170619e92f8f95 SHA-256: 6bdd233e2733a7f4c4ba9c21090394618cd00238d6b54d761b12f7d8bea4dd15
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=custom+enchants+minecraft PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff0d4dd686d5.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/75bdd76c361c5e.pdfIn PDF document text
    • http://gbarb.me/essential_oils_pocket_reference_guidedma3f.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/kiwukukalefidosisazerin1s5n.pdfIn PDF document text
    • http://getcreditreport.info/39706730020f3s2v.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/Fjbihpz/plant_cell_vs_animal_cell_organelles_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_5fe9c87e112cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_6011e719366a3.pdfIn PDF document text
    • http://batmbatm.ru/easy_no_bake_cake_recipes_for_beginnersiad0r.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/MGYMgfQ/crackle_spray_paint_lowes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_5fcbaf0595224.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/ugigjig/juzukulixuruxexagegema.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/Zhije5I/gewebewoferovidoxis.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/datarofapakil/android_10_samsung_a30.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/37535314837.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/78483163240.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_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 4996 bytes
SHA-256: fe1ada07824a6b712cef4a6203101a9ddfbc79e0825e7e28c521a356e4acc8d6
font_01_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 13376 bytes
SHA-256: 64f94adf8345e3c9cc4c657520359fc47e76688d207d2aa0acd310b75997cbbd
font_02_sfnt_off00015061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15061 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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