Malicious PDF — malware analysis report

Static analysis result for SHA-256 669cb18e0fc67335…

MALICIOUS

PDF

34.4 KB Created: 2020-11-07 02:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bd94b194c5d7d87f7d9083c01414e39a SHA-1: 18c1fd179b10feca042681b3b570de3af8000691 SHA-256: 669cb18e0fc67335b678072dff464c6159dc751f987156ca15d7b7e6cbdb50a9
66 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which points to a suspicious URL that appears to be part of a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body text, while seemingly innocuous, contains the primary malicious URL, suggesting a lure to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=bellville+street+fair+bellville+oh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f91a7b96ed4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f95956081f9c.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/0d194f83-236b-4390-8f71-029fc5c9b190/lumarufewaduxewejegupejew.pdfIn PDF document text
    • https://wudavagen.files.wordpress.com/2020/11/88762027956.pdfIn PDF document text
    • https://bagawux.files.wordpress.com/2020/11/top_alexa_commands.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/wixokuvidagufuzulave.pdfIn PDF document text
    • https://zedapakaxivi.files.wordpress.com/2020/11/satopotiriwo.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/xizadub.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/aaoifi.pdfIn PDF document text
    • https://sifuwel.files.wordpress.com/2020/11/71208495742.pdfIn PDF document text
    • https://mipezutaxujo.files.wordpress.com/2020/11/star_trek_online_cardassian_uniform.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_off0000480e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x480E 5104 bytes
SHA-256: 15d17b9eecca5d036af075bbbc13eb4be30805f20de91ac6c695efbda8606446
font_01_sfnt_off0000596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x596A 10436 bytes
SHA-256: 6c3d2f501049a7505ff165e9f7a0f0aeb3608644c68ae0fa41e2fd7a7fd77904

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