Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ee3aea89c73d2…

MALICIOUS

PDF

71.7 KB Created: 2020-12-05 23:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 981cc64b7c5ba4dab89382e3e53d6799 SHA-1: 90ae507589c64869fb124fce783a48d24390087a SHA-256: 765ee3aea89c73d22a924f090bd4fe2be14437b089840e08ba5a9bd4a589f2aa
156 Risk Score

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 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 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.
  • 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://trafffe.ru/strik?utm_term=metal+slug+3+apk+download PDF link annotation
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/4135221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0dbcbbf71053ccb0ffb78/t/5fc1172acb3e0f5771761fa0/1606489898876/utep_degree_plans_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/freedom_high_school_bell_schedule_oakley.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a2af7848ba205d23b5ba/t/5fcb2ed036758319a54ee14e/1607151313639/ikea_near_long_island_city.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2926488c99b6d37b1eb4e/t/5fcbf078e43f2b00a8912d5a/1607200888921/57534465076.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/cast_iron_toilet_flange_repair_kit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15a3c60f2895dc1eafeb7/t/5fc342334f9837572048fca4/1606631988580/35656295135.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0f71fa04221c71e82ee4/1606291314338/26358460715.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/18896492416.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/electron_configuration_of_o2-_ion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc597938139af0376650267/t/5fc9851c2f5dbb44b771eb8d/1607042332780/guadalcanal_1942_world_war_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51d24f98375720d6fecf/1606373843649/xajoguse.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/neet_biology_practice_papers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 5188 bytes
SHA-256: 7af30013277f15cb9d577123fd30631f6f4e10d7c5a791e46dff588b5683538a
font_01_sfnt_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 11200 bytes
SHA-256: 7208d09fd26c6a27db8d2a45c8a23daf21654e81c36b4959443225dc3de5b70d
font_02_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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