Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8655fed222e43af…

MALICIOUS

PDF

71.2 KB Created: 2021-03-01 03:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 018a69a08aa0b157aee503e5e4f1c455 SHA-1: 51b47b6294c1e7fc64c33ce7aa74b87223b1cfe5 SHA-256: c8655fed222e43afe927e35cd13c35532e57ebbf5a273735d98892300da58a9e
96 Risk Score

Malware Insights

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

The file is a PDF document that was flagged by ML classifiers and ClamAV as malicious. It contains embedded URLs, one of which is `https://mezovuduw.ru/aws?utm_term=giancoli+physics+6th+edition+pdf+textbook+free`, suggesting a lure to download content. The PDF structure also indicates potential duplication of objects, which can be used to evade detection. No scripts were extracted, but the presence of external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/aws?utm_term=giancoli+physics+6th+edition+pdf+textbook+free PDF link annotation
    • https://cdn.sqhk.co/disegivoji/vJjeLCr/first_words_for_baby_to_learn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_601aaaa1786e7.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/irhiUhd/49196447175.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/klhfhjz/honda_accord_transmission_fluid_change_how_often.pdfIn PDF document text
    • https://cdn.sqhk.co/kubafipefo/xgeigC4/weekend_edition_sunday_host.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5fccdff69d843.pdfIn PDF document text
    • http://maslovauto.ru/inelastic_and_elastic_collision_worksheet9pkc9.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/delhi_pollution_level_today_reportr5irv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6022d2a06880f.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/dz2hgWw/guvomusaze.pdfIn PDF document text
    • http://1yamal.space/go_driving_school_simulator3daig.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/d37vkhi/24756729205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5fd8e596973a4.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/kevava/oracle_select_date_between_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/ceramic_cutting_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/vesivudasugawibineduwuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/the_three_musketeers_imdb_parents_guide.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 5804 bytes
SHA-256: 0fe2c4c58a3accbbf214de95f65c9d787e513ff3560f7e370455856740d62bd6
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10716 bytes
SHA-256: 435c40401544795537be25db75e8dcf1d8bdd0915085ce956703e446b1d88391

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