Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d58f33e44ab6ec…

MALICIOUS

PDF

33.1 KB Created: 2020-11-08 12:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a76db358f9c3111f91defadfe4fb4fc9 SHA-1: 17039a0957f0850fbc61fc5e52e2f01405371845 SHA-256: 05d58f33e44ab6ec8bf7eb108fb635770373e7b181de832d7552bf29583df649
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful content.

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/aws?keyword=eee+uci+edu PDF link annotation
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/wixesapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f969b308d942.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/jobun-kofogul-nulupazovif-vujupokenilagi.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/6560368.pdfIn PDF document text
    • https://xozukogazi.weebly.com/uploads/1/3/4/3/134371147/woloten.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/8710724.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/0f50fa66b22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vutame/bihar_stet_syllabus_2011_download.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://tumitom.files.wordpress.com/2020/11/wazupalapiriwiji.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/apush_period_2_key_concepts.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/mathematical_operations_reasoning_questions_in_hindi.pdfIn PDF document text
    • https://dufakeribeze.files.wordpress.com/2020/11/laurens_county_arrest_and_inmate_search.pdfIn PDF document text
    • https://karepoxazul.files.wordpress.com/2020/11/xumamosudokemamulired.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_off0000478f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x478F 4376 bytes
SHA-256: 1b2816936ccbead94561c51977cbc7c54a458014193bda1f02d82e7a5a73351b
font_01_sfnt_off00005686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5686 9820 bytes
SHA-256: e4c439ede84d0f7bc4ab960a706e187fd74625561b96be68763d60a278129956

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