Malicious PDF — malware analysis report

Static analysis result for SHA-256 f177494872a46f54…

MALICIOUS

PDF

66.6 KB Created: 2021-02-02 12:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 29700a19113427f6dc089e36d201bb05 SHA-1: 274604f3bbdffbe151504010c353b0d057b3c7e6 SHA-256: f177494872a46f549d93149701ac344c45c9d4f7ca4efcf2b8b8c58a9da586b0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with the primary suspicious URL being https://seumenha.ru/123?utm_term=translation+practice+worksheet+pdf. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is designed to host numerous external links, potentially for malicious SEO or to distribute further payloads.

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://seumenha.ru/123?utm_term=translation+practice+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fcb60e74d848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_5fe7fde4c6824.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/dhjihiW/fantasy_kingdom_defense_hd_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/fkjc8je/55413745936.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/Bie8gle/22851223221.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/N6hiPQc/xibipuxaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/wKbxhdD/ramp_car_jumping_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/hbjhcgf/sat_practice_test_4_answers_math_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/jQhcihc/rapatusu.pdfIn PDF document text
    • https://zipatusuf.weebly.com/uploads/1/3/4/0/134012633/6307558.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/gjgijeC/i_love_crosswords_3_level_26_answers.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/tixeligufokup/70964978554.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/recording_dividends_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/wonder_book_report_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/xusubisofurodawunu.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/gamisizow.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/school_days_mod_apk_android_1.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_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 5348 bytes
SHA-256: 965eafd3a5c0cf0a23b313bbeec511091d6a50a2818c9ac356130ea9ac447c1a
font_01_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 10684 bytes
SHA-256: f6063b5d016d039e059847f432c909109b303eed42604cd41e0749920ecb2805

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