Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd08072a79d98f22…

MALICIOUS

PDF

92.7 KB Created: 2021-03-09 14:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 351f7afc7264d7447bb961afb4206e72 SHA-1: 9e913fde01f079046f271b1d9ed37df0e6aa0905 SHA-256: bd08072a79d98f22a7fd1662bcc359f07856ab2b879f3e8b250011a969bb8774
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 0.9998

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://midufefew.ru/award?keyword=qatar+arbitration+law+pdf PDF link annotation
    • http://gutafagiwoja.iblogger.org/satinisujugubigaju.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/e8e0adb19261.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/fusaliliwub.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/7b61eed72.pdfIn PDF document text
    • http://matanusebatug.22web.org/lidexoromoloxuposug.pdfIn PDF document text
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/4a3f5.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/cif3cif/kowufigazim.pdfIn PDF document text
    • https://cdn.sqhk.co/xepiriza/Q8ggWR6/patolepusher_mini_r_coin_pusher_for_sale.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/48121274126.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/ddf7e668-cd65-4944-9e50-da62e985cc9e/selemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e946c91-2b53-447c-9b2b-e92aa101188f/nolusaluravamul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26929109-c330-43f9-a4ce-acf691bc8b7b/vonozovakalolivawemotofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9a7a4a-62fc-4c76-bca4-5d19722d6d66/54202514577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3a744e-71c5-4c76-8076-2a13f0b8260e/mythbusters_scientific_method_practice_sheet_answers.pdfIn PDF document text
    • http://faxaxesaxejov.rf.gd/wolipiriwibasuvo.pdfIn PDF document text
    • http://fositelorefux.epizy.com/assyrian_and_babylonian_chronicles.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_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 5152 bytes
SHA-256: 0121a3c6a04b12caede2df9e3722358b6daf5858f6da3f2bbd287294ea23dfc9
font_01_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 10196 bytes
SHA-256: aced9846bf2f89fa8fa8e4e610a01fb7e3271664f4e7c8a5c5f031dc0ad69a8f

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