Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e54aa8bd81575a…

MALICIOUS

PDF

76.2 KB Created: 2021-04-13 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 731a232857d7b8a16927a37322e7be07 SHA-1: c22220581abf0a2098a0edd25c390cf073a051bd SHA-256: d9e54aa8bd81575a6557cc63d396abaa4d9a4a2c4cab6386bcf4e307218a2b3f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=padi+open+water+elearning+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404123/normal_6035e800c7bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_601caafd888ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_603fb20231e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_602582f108224.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/19735294291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_602515f24b007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fdf291f2dce9.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/djbP6jj/niximevivuwifevo.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/jaXchiJ/garden_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/molofagaji/akpvqjj/putizazovokeze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff0acedbff7b.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/9gcCAhi/mixavijux.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/asvab_practice_test_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/T5Pjggd/57034419314.pdfIn PDF document text
    • http://delinapod.mypressonline.com/wekogobime.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/jaQd6gi/full_hd_screen_recorder_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_5fe609f189800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_b1a8dabeebc14e04b5f52a49fd3da14c.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_8d43ee61fc254177943813df91b0959d.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_6464fb3a93004f60a9889b019450514e.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_20e0c142470d495b9e261a43bc69be3d.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_f50f96236bf94396ab5c794cd9ad6bd5.pdf?index=trueIn 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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5196 bytes
SHA-256: 92bcac2f2db3b40d6eceaf39e5c527c41032499dcf94d3be8c12edfbec635fa9
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 11228 bytes
SHA-256: 19798bd2179a5d2bdf9ec21e6c28fb79303d50c8d10dfa84695e9cfbd330d041

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