Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd421981aee540f…

MALICIOUS

PDF

65.2 KB Created: 2021-03-10 18:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78db13ca0f7ba99a5e716d8e0c067f6a SHA-1: 5858c8f7ced7a9f5df56bf0c676e788ec7c169b0 SHA-256: cdd421981aee540f079d7cd0ef058a0c4bb527bfee95ff3de63ce190ba1003cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://leonvi.ru/123?utm_term=video+cutter+software+for+windows+8 PDF link annotation
    • http://lexibanoma.iblogger.org/albiceps_tarantula_care_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/jaeiajH/free_internet_nfl_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_6005114241b66.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/dhjgfih/3d_max_interior_design_tutorial_video_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/ejeOjhT/zidezuduzozoxapir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5feb1804a8d3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5ff2d2c11964d.pdfIn PDF document text
    • http://motowifenizemuz.22web.org/passport_application_form_editable.pdfIn PDF document text
    • http://rimanugoxomage.22web.org/three_bird_nest_boutique_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ff471b440478.pdfIn PDF document text
    • http://xerojitir.iblogger.org/sokifomegerufigupap.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/aK7gcjh/tulibamonuwenidakekerisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5fdc2829abf91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danijikuguwidak.rf.gd/50334305847.pdfIn PDF document text
    • http://kegunujav.epizy.com/fort_bend_isd_police_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cb05e8-7016-48f9-aa74-62b396f9ab22/trane_xe90_inducer_motor_replacement.pdfIn PDF document text
    • http://koxaxinum.epizy.com/basic_instinct_3_dual_audio_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438cddbf-b407-4d8e-a856-94bda405da4d/speak_with_distinction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37856b28-ee0c-4f12-a29e-cb906886d1ed/the_physicians_desk_reference_pdr_is_updated_every_6_months.pdfIn PDF document text
    • http://tatefubuzu.rf.gd/59011413522.pdfIn PDF document text
    • http://zilomit.epizy.com/past_simple_negative_questions_exercises.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_off0000c5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 5236 bytes
SHA-256: dca6eaab4a43ed7e26e95fc9b27560b14ac7d2802603294eaab6470ca3ee5be7
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 9356 bytes
SHA-256: dada561470a27ab808b9f79cd4027816fd1bd650b7b534b388797b556265021b

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