Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b45fcbe293fabd…

MALICIOUS

PDF

65.9 KB Created: 2021-02-09 22:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b6131ce5ca243dfbe8a23b450f854b3d SHA-1: 850e0e2f2da0dafce64dd6665a78216d8e07c1fe SHA-256: f5b45fcbe293fabd1474af1ab119e42ec4c21f86a4f00ee0474366fb9926f231
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. Many of these links point to unknown or potentially malicious domains, suggesting an attempt to direct users to harmful content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://baarspo.ru/123?utm_term=ati+firegl+v4800 PDF link annotation
    • http://dhl-order.info/banff_national_park_trail_map06k2b.pdfIn PDF document text
    • http://italysummer.fun/baby_first_words_foodvae38.pdfIn PDF document text
    • http://teachost.com/chef_knife_set_amazons23ih.pdfIn PDF document text
    • http://shoop-fh.ru/ligavivupgxxs.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/2728827.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/bimaborogekajiwonoverikaw3cbux.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/7e05669.pdfIn PDF document text
    • http://pomirkapa.site/copperplate_calligraphy_from_a_to_zyh3j8.pdfIn PDF document text
    • http://tibetterrier.ru/39936508406jcod7.pdfIn PDF document text
    • http://handler-autoscout24.com/victory_bible_reading_planljzhv.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/gofilafixu/assassin_s_creed_xbox_360_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/jasper_report_example_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/beganokuparise.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/qualities_of_a_transformational_leader_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/arya_film_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/relative_pronoun_worksheet_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/days_of_the_week_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/android_phones_with_best_camera_philippines.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_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 5020 bytes
SHA-256: 2085ac0f8f5238c5d006b1086c98a7daeed54b421e42f348ce932346a08e05ed
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 10824 bytes
SHA-256: 407e466b240d9c61fd1ad4e2ae1059807b152b216ae26e6da0cf4f9178abcfef

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