Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd272eee8e0f1ec…

MALICIOUS

PDF

33.1 KB Created: 2020-11-06 10:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 178f7478ebd9ac6cef14d37f5441ed62 SHA-1: 17b6479698caf0cdcb7aa96982030074c286dfdb SHA-256: 4dd272eee8e0f1eca0ac5b8e6c929fa2d5209ce41296ca50cb6f5ef7d9dd5685
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and a primary URL associated with a keyword search for job opportunities. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic point towards a phishing or malware distribution attempt.

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://trafffe.ru/strik?keyword=charter+communications+jobs+macon+ga PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5fa14e6b24d81.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/cb1de89623a01d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f8ba249027c3.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/2dcf0d7cc364.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/zakidil.pdfIn PDF document text
    • https://lezivefa.weebly.com/uploads/1/3/4/4/134458465/db44ca98245d8.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/jilaxirobej_muxemufezer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f9580a4407b3.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/c1825d7.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/soxakogu-pemiboki-dasepab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8427/6411/files/31626262568.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/16531300465.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/sailor_moon_creator_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/wordly_wise_3000_book_6_answers_lesson_3.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/bijiditesuzomife.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/vufazumiwigexigulatodige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0449/2438/files/yoga_sutras_of_patanjali_in_telugu.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_off00004599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4599 5304 bytes
SHA-256: 2c27a7c67b476067355ab7fcaec8a2f9537c2e502f675bf855f84155534a2810
font_01_sfnt_off00005775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5775 9324 bytes
SHA-256: cc9d319cb79b3c91b762cbcfa0a5707712957a6cc0260db8265dba8868d9592f

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