Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08b6862329d1244…

MALICIOUS

PDF

77.0 KB Created: 2020-12-02 03:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 11e96b9f07434f3043bafca4d656ce3d SHA-1: 23c0bf7f9389f58389857750bf9f469cf0c8daac SHA-256: d08b6862329d124452aa591a3d16f1a7d602f21a0a613699108035eda7c9257b
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 0.9998

Heuristics 6

  • 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.
  • 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://trafftec.ru/strik?utm_term=unclaimed+experience+trauma+narrative+and+history+by+cathy+caruth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f87eb375166b.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/7366287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f911d414fb68.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/6bedab04d.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/3621861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5fc6c6307a7b6.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/lepatuganuk.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/rikogamutu_zibano_ramemo_nimegolibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000e653.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000e653.bin)
    • https://uploads.strikinglycdn.com/files/b648fe7b-54e3-4836-8b3b-b0ecf57a57e5/french_kids_eat_everything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066edfdf-c6cb-4102-8f66-4dbfd2098b3e/zefiborikotimenesotunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f7a46a-d3e2-4ab4-a444-38ffbb7c39aa/nefidubukaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/the_adderall_diaries_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/fedovozesamav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41c5363-9d83-4bc0-b443-0b16f9ee0e5d/duluth_shipping_schedule_for_today.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 extracted file (font_00_sfnt_off0000e653.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5672 bytes
SHA-256: 3c7b8e1862690f4319c8b9f2484a00fb762ad1b55fff33ad79fa20a9f6ed3f53
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 13396 bytes
SHA-256: 7285468b4dea2dd8b24952cd44917a83623af9c36e1cead7e3cded0f005cf698

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