Malicious PDF — malware analysis report

Static analysis result for SHA-256 93282539ebeeb6e9…

MALICIOUS

PDF

78.3 KB Created: 2021-03-08 13:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc6a5aeffb611dc083d0e78d76760b5f SHA-1: cd7d71b8d99db8868180d903b0344f2b3e0a2a10 SHA-256: 93282539ebeeb6e913382732aa1184947ce82bda12a48ad64a2a46ef95a4ddd0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vilenefex.ru/123?utm_term=google+sheets+offline+mac PDF link annotation
    • http://lidomuxadade.22web.org/craftsman_lt_2000_parts_manual.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/vajigikaluzenarifos.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/xoferuzu/bach_invention_no_13_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/62717196373.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/ppsspp_emulator_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/arjun_pandit_song_pk_free.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_3397e2f574014916be5de03de76e6bd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/69435694402.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/is_the_walmart_black_friday_ad_out_yet.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_39535da3509b4a74b5998768b6e62ea4.pdf?index=trueIn PDF document text
    • http://zorikeroz.onlinewebshop.net/dell_latitude_d830_maximum_memory_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/technical_drawing_past_questions.pdfIn PDF document text
    • http://dofumuligo.rf.gd/lucian_top_guide_s8.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/piriform_ccleaner_registration_license_key_free.pdfIn PDF document text
    • http://tuguxukoz.epizy.com/is_onenote_free_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/95421267222.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_6d039009fc114a40b1fe798a293d3cd0.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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 5232 bytes
SHA-256: b2e255cf89d3a05cee2c4138c66ac28666d6db209a2bb276700d5f8c815c99e9
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 11288 bytes
SHA-256: d9070e93bdfca28d1428e7b45151c25f622ac5aff826e2be480fcf6f31f0fa40

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