Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dba4ba2fd073bca…

MALICIOUS

PDF

40.8 KB Created: 2020-11-08 19:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fb3fd433a6cac14635175af99ec036bb SHA-1: 1d27612962c93c9d53f074de9e2c8d5ee18f934a SHA-256: 0dba4ba2fd073bcaaea0ef418faef1a7ab12fdb41eb583e9a723367754d665e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful content or facilitate further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafficel.ru/123?keyword=jorge+garcia+now+pics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419413/normal_5f9e7faf7ca78.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/tapusimip.pdfIn PDF document text
    • https://vasegalewi.weebly.com/uploads/1/3/4/5/134595350/4572041b.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/171890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f94820a08e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f93aaa8d7fa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fezesidofe.files.wordpress.com/2020/11/holy_spirit_lyrics_by_rita_soul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28dbe86e-6c5b-4cc4-814c-3340eb1c40fa/60749853227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b63269-d4f4-4b78-b959-5f107932aafb/videgorotim.pdfIn PDF document text
    • https://xubadukefira.files.wordpress.com/2020/11/exercicis_categories_gramaticals_i_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad94386-393e-4477-8d3f-95df6ecd3691/37388780448.pdfIn PDF document text
    • https://vamemileja.files.wordpress.com/2020/11/remove_azure_ad_connect_manually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9219cc63-1c1f-447a-954c-e8458305f5cd/91416932371.pdfIn PDF document text
    • https://wiburowugivu.files.wordpress.com/2020/11/thomas_calculus_matematik_1_trke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49277a1-3334-42e5-aa68-4abcde52c2a4/nodetawuzozimopiviwi.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_off00005ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED1 5148 bytes
SHA-256: c6dd7d3ad821ef0329e0ff7d895e4649fd7c205869e2e4cae7131eaebf023ae1
font_01_sfnt_off0000707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 11216 bytes
SHA-256: 6f09a065c83ed9d65756be884dec0fd40bb0f8fce5fcea2d6fe803d7cc4c114d

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