Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02f110e681adda4…

MALICIOUS

PDF

41.1 KB Created: 2020-11-06 08:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0be4fa9a3d27ff16616709757c651577 SHA-1: bdefdfe0ae7a60246c52b4fa122038f82747c89b SHA-256: b02f110e681adda4e7701e49b9136aac4cccb682dba30936f6c51e93a4568578
134 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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?keyword=sic+itur+ad+astra+means PDF link annotation
    • https://nabutamu.weebly.com/uploads/1/3/4/5/134525390/nifapop-tevix-xidolepu.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/12942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_5fa08cf21d48f.pdfIn PDF document text
    • https://kakezilek.weebly.com/uploads/1/3/4/4/134401463/vezalox.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/cd56bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f8b2cc1d3d8b.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/tofibapifumefunuwaju.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/kabavenutuliv.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/sukedil/aha_bls_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f797712d-c9e2-4d61-8203-4c8f98460319/30630680022.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/50784109205.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_off00005d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D34 5156 bytes
SHA-256: da8587b8da92273114cee9304f186ffb598cc039307d795890c1c7d500d45d8e
font_01_sfnt_off00006ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA7 13408 bytes
SHA-256: 9004a01876a6b2c90a276aee29cb65b84419c2d964c5ae9a3fa1474d0f6b769c

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