Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffe3e74351abe52…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 02:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a33c3a246c8f98cb9c959918aac0fc73 SHA-1: 512ad16c79871c5b5a5ec726b745f358eb2fe4b8 SHA-256: dffe3e74351abe52f91e5c62bbb0ad861765b543aef93357070208761dface83
74 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 an ML classifier. It uses an invoice-themed lure. 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 0.9992

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/123?utm_term=gate+fold+leaflet+template PDF link annotation
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/mavazoraj_fifogat_gipof_luredi.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/modern_probability_theory.pdfIn PDF document text
    • https://sewowifef.weebly.com/uploads/1/3/6/0/136082850/d54674a81.pdfIn PDF document text
    • https://bazusatibewin.weebly.com/uploads/1/3/4/3/134374280/zamivuligelaluje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_6026e4f3827cc.pdfIn PDF document text
    • http://temilops.xyz/gobokefirajibalexejajebolew41h.pdfIn PDF document text
    • http://ourfutures.space/daxugisosesacova7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_60412baed94a3.pdfIn PDF document text
    • https://nabodavovi.weebly.com/uploads/1/3/1/4/131406515/f5b4a0f222d0a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_602a39ea323ee.pdfIn PDF document text
    • http://antonio-ita.space/what_happens_in_the_theory_of_punctuated_equilibriumsc1eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fe1233026105.pdfIn PDF document text
    • http://grantmedica.ru/todafejadomisobuweliif5a3.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/farebuja.pdfIn PDF document text
    • http://zofugef.mypressonline.com/zoxojoponivejamutirikon.pdfIn PDF document text
    • https://paporese.weebly.com/uploads/1/3/1/0/131071113/1886593.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/school_billing_system_project.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60449533022af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_600fc24e80cda.pdfIn PDF document text
    • http://detonic-de.website/97413991289qgy3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomapalugaji.epizy.com/hide_navigation_bar_android_one.pdfIn PDF document text
    • http://wosepejodobedaf.epizy.com/tesavog.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/principles_of_effective_oral_communication.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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 4944 bytes
SHA-256: 8acf3cee330235e926cad3fa1c77f83f9720e650bf760df5a543d349caa83fc9
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10404 bytes
SHA-256: 47dc6c2c4c7b2781ed6cb49b8054cd0533e8dab8a6b93cc5c5226e96a3626c36

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