Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceafcaab0b381e8…

MALICIOUS

PDF

70.8 KB Created: 2021-06-06 05:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a120a40a16dcc89f6ea30db7141ae20b SHA-1: 1e278e55ddf60dbbb05885fcea2658c09523737a SHA-256: 9ceafcaab0b381e8bc7a59c9238cb0e0fd7bf1f938160efef3504725d9a9e57d
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://krisoc.ru/pbw?utm_term=how+fast+will+a+80cc+motorized+bicycle+go PDF link annotation
    • https://lubojedibejet.weebly.com/uploads/1/3/5/3/135329630/371770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6053205f8366c.pdfIn PDF document text
    • https://bewirawafatuli.weebly.com/uploads/1/3/4/5/134595338/tanopenabowaxez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_601906ecbfb90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_5fe878bdb29ab.pdfIn PDF document text
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/6354953.pdfIn PDF document text
    • https://vesilaxevi.weebly.com/uploads/1/3/4/7/134735958/puwolaresafigu.pdfIn PDF document text
    • https://sumadapovememer.weebly.com/uploads/1/3/4/4/134494733/5952891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fdc6e133539d.pdfIn PDF document text
    • https://kuzasafeg.weebly.com/uploads/1/3/4/5/134586407/162b1.pdfIn PDF document text
    • https://neseriduro.weebly.com/uploads/1/3/4/8/134851425/najud_wolaxozakolefi_degiwewizilas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_604e303f5f5b5.pdfIn PDF document text
    • https://rimudidux.weebly.com/uploads/1/3/4/5/134597050/varurugisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a875fd-0a8a-4b65-89d8-9e8aa85e74d6/fedex_customer_service_jobs_memphis_tn.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/73183958077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61bb3fa0-5ae2-4148-bd8a-95eae53282e7/78462738507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9d3594-4336-40fc-b189-bc7b06c706a2/how_to_write_a_simple_rental_lease_agreement.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/f/83920884618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08b30da-17e5-4518-b86e-93e597bdc4de/73264725406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bed5d0-0e51-4f2a-935e-c018397c8246/sportybet_balance_adder_apk_free_download_for_iphone.pdfIn PDF document text
    • http://welomobo.pbworks.com/f/total_knee_replacement_rehabilitation_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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 6020 bytes
SHA-256: c48cf05bca4b2e3b6518a78886011f0a7a57a57f1e1fd1b8a19291d86fa458fb
font_01_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 10352 bytes
SHA-256: 2556037eec7d3578fae7eba8aa43717d8d1d2ad2cf8b73b8b1a1de40838bd751

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