Malicious PDF — malware analysis report

Static analysis result for SHA-256 066a5e16dfb9b6f2…

MALICIOUS

PDF

73.1 KB Created: 2020-12-19 09:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: add928cb3a16ba1592913d79008a87bd SHA-1: b778f58380ccd035711f13ed9df20480d7c1495c SHA-256: 066a5e16dfb9b6f23d0021b48a72a17eaf80c25d7d5ad531d56fd0476bb8a75a
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 0.9997

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://trafftec.ru/123?utm_term=washington+state+dmv+kent+wa PDF link annotation
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/64678f6c5679a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fd77ad89a3d6.pdfIn PDF document text
    • https://lesuwigiwojan.weebly.com/uploads/1/3/4/3/134309114/1063135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_5fabb43322c04.pdfIn PDF document text
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/3bf29b655.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/6316836.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/6152965.pdfIn PDF document text
    • https://baxajufukawe.weebly.com/uploads/1/3/4/3/134338502/milupelizarurud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf2162edfcd2bda907be8/1606218263624/1635987786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836c7fb7-bf2e-472b-b11d-7bec462c89d6/56638818594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78846a93-e69d-442b-9b61-910773f18e1a/stc_summer_schedule_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57982a879396864270a01/t/5fca3c2ad7c3040d873c3e5e/1607089194938/74152341683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153d5c84-1500-4c0c-9c95-55259b190680/69827340180.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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 5340 bytes
SHA-256: 4cb82691d2a6ac74d6e60c4a0ef27bf6d238fc42896a9b4b36a4859f663ae47e
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10804 bytes
SHA-256: 15a8b49176ab5159a3ca2fd53d707b5772cbffa51c7233c15621a28efcb643e5

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