Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b3ed75da6ae114…

MALICIOUS

PDF

69.6 KB Created: 2020-12-19 00:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7f585e3668a84465941d4214c220aa80 SHA-1: c84efe9af45d8c97ef615043bf37d73cc3a5c307 SHA-256: c8b3ed75da6ae114f497864fbf2055e3da9d1070c43667b27db3de295b46fd7d
196 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension. It also contains a large number of external links, many of which are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/aws?utm_term=chrome+proxy+extension PDF link annotation
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/dajuziruwiw.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/7da17d11.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/benubapopikaj/catholic_rosary_prayer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/metformin_er_coming_out_in_stool.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/approaches_to_industrial_relations.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf566dfa04221c71175981/1606375022523/13_days_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65ee93398ff751553172a/t/5fc69f217acac6192aab636a/1606852385770/clash_of_clans_world_championship_2020_bracket.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc297918139af03764ff7e8/t/5fc42175fa04221c71a1d399/1606689141901/don_john_much_ado_about_nothing_character_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46913b5-6b5c-4cd5-8dc9-8fe8a9da7139/kobopiforudarabokobaxapu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/761086802.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb77cc464b41678cc2762/t/5fdd2966e64f5703150b2015/1608329575185/secretarial_compliance_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ca1c34-bc7c-4703-986e-2b51cc45edca/lawugagezesonegugune.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8151ac7e22a65153ef0/t/5fdd268c43addf6e2cd67c4d/1608328846726/pvt_ltd_ka_full_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcee60965288022f4f57f26/t/5fd22d5bef89ac6683806444/1607609691988/personal_diary_with_lock_app_for_pc.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 4892 bytes
SHA-256: afadba910319df68c4c8c17bfab97d83229da6e35737a4f443436745056886d9
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10172 bytes
SHA-256: e4aed28131f8f3791b499fd3d4044e859a7c8db4fa3aff013b64a801c9b71a6b

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