Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0583dab7bb7f87a…

MALICIOUS

PDF

70.1 KB Created: 2021-03-08 19:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fba13e92bcaaa4a694b79a9a7e6dcc99 SHA-1: ed1e73087c398a241b63c35f8c54c68ecedc9551 SHA-256: b0583dab7bb7f87a0a54f15ff8459b5704c8c4a14ab1b49cc0c557e9366f36e1
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used to host a malicious payload or redirect to a phishing site. The PDF's structure and embedded links suggest it's part of a link farm designed to obscure the ultimate destination, a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=recursive+formula+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485173/normal_601e491d672a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_60096cd13a053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_603de38f1a43c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5ff2e52136180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_603b6aa239528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ffadb4851bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_600fa5305a86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_6027e630b41a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_60264255ba614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwesiserej.epizy.com/repotomurose.pdfIn PDF document text
    • http://wizajevul.epizy.com/milady_esthetics_student_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/53061104931.pdfIn PDF document text
    • http://vusomafolu.rf.gd/please_find_attached_completed_application_form.pdfIn PDF document text
    • http://kowutixadexomaz.rf.gd/85058659085.pdfIn PDF document text
    • http://womufigi.epizy.com/technical_analysis_explained_martin_pring.pdfIn PDF document text
    • http://sevetise.rf.gd/le_petit_prince_chapitre_16_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/99156784033.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/bottom_bracket_cable_guide_halfords.pdfIn PDF document text
    • http://pibonev.rf.gd/hero_wars_titan_leveling_guide.pdfIn PDF document text
    • http://tekaxipi.epizy.com/98272994554.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/alcohol_120_per_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/haier_ac_mode_symbols.pdfIn PDF document text
    • http://jimatisejur.rf.gd/how_much_do_navy_hospital_corpsman_make.pdfIn PDF document text
    • http://negekipewunej.epizy.com/26951490652.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/canon_driver_configuration_tool_user_s_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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 5616 bytes
SHA-256: a4d644a5ef32d07438da4af350b0e65a92ea6da0a8360e2d304acb90d7403055
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 10356 bytes
SHA-256: 07246cb877e63a760e79a271b741caeb665eff4dcc2f8d844674dea37d404f6a

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