Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e5fac0a77856a5…

MALICIOUS

PDF

78.2 KB Created: 2020-11-17 16:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 94604fe8c1752685b3e29cbc2e327b59 SHA-1: d666369678afe12781eaab4566cc1344210e0d2c SHA-256: c3e5fac0a77856a59f089c874372f721dbbd416ed9898d0bcbd438f451037115
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. One such link, 'https://traffine.ru/strik?utm_term=samsung+galaxy+ace+gt-s5830i+manual+pdf', suggests a lure related to a product manual. The presence of a large number of PDF links, including one to 'https://s3.amazonaws.com/nijudow/luray_caverns_discount_giant.pdf', indicates a potential link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffine.ru/strik?utm_term=samsung+galaxy+ace+gt-s5830i+manual+pdf PDF link annotation
    • https://navadajedu.weebly.com/uploads/1/3/4/6/134614390/vekapunurudo.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/nijudow/luray_caverns_discount_giant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe29e751-ef1e-49a7-91bf-809b8252cfca/61621549104.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/the_wifes_story_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/xajenagasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ad46fa-3395-4219-8083-6f0decc59afd/godubajejije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64d8d40-1c8d-420b-869e-189ad179d271/apa_aicp_practice_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d98492-837d-4112-8efa-710464e8339e/63640977245.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/living_environment_survival_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/receitas_para_dieta_cetogenica.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/ge_spectra_xl44_self_cleaning_oven_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/zenegabutimego.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/quantitative_seismic_interpretation.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/6916933834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07305d6d-9655-4215-b540-e73d97ea890f/59963062438.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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 6308 bytes
SHA-256: 8f85a3d0aee487ef31033453302951f8f4bf3cc4af5441a03e0e1f4608be5107
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10960 bytes
SHA-256: 6a43d7f5bde43391f32d221ec4c0f69341f4d1fe16677f93ca924a31817d70aa

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