Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0a6ebf044e78f5…

MALICIOUS

PDF

70.4 KB Created: 2020-11-20 03:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 753569ae07ab7527b3723df2b9bd9319 SHA-1: 90a8ce807eebee3fdba97d48b0ca23803118d5a1 SHA-256: 7b0a6ebf044e78f5272bb656b5c7ff499202b049295944e3d41cabd04ee9992d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=bridesmaid+duties+checklist+pdf In PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/1438409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5f95facb1afea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_5fb53cd550885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/felasorarabipis/93992045312.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/angular_material_dropdown_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77bc558-1205-4b72-b651-4df426afd3da/76331762518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0615bef6-13d6-4f62-9daf-3dd5010dc340/bezoravitirevejevo.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/the_road_not_taken_story.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/mimarurejifoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/41195452235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1cfdc7-14f0-4951-9b02-dc3bbffac0b5/64435259895.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5176 bytes
SHA-256: fca0d419a85564e1d7fbf9e7a8646be55b2c6e2a348bc881709c8ac71cc23d30
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 9544 bytes
SHA-256: 55f110913a2b60188561b3d23f861aa1acf8053924f21b9e9900c0f4ed3ab0db
font_02_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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