Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28059a8efb4284b…

MALICIOUS

PDF

76.7 KB Created: 2020-11-06 11:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a9d8fa5ad70b88b62fc100bff08dc560 SHA-1: d87e594bc04792f6a806613eece49e69c64b7170 SHA-256: a28059a8efb4284b62b3a797eb1e3dbdcc61318f597ad4282093eadebb9424c0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/zijulebar.pdf.
  • 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://trafffi.ru/strik?keyword=saprotrophic+fungi+remove+excess+lignin PDF link annotation
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/zijulebar.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/7312272.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/mukut/5_critical_elements_of_throwing.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/fcps_geometry_pacing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7d1f01-fe25-48f0-b6d3-e40f9129f845/15741551262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470493c1-7042-4e0c-a8cd-934ac4079508/judge_brett_london.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e45d2fb-f61c-43e8-a1a1-be494fddb849/797284689.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/46635616441.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/pema_chodron_comfortable_with_uncertainty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d73333c-f75f-473b-a630-80fd98bd377a/fegoxijusejipexupaf.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/peter_griffin_roadhouse_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/potaw.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/83429670305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86681800-fdc7-42de-9fdf-6395fcc688c1/kolevufuvefanavepeziguma.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/atomic_weight_of_chromium.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 5660 bytes
SHA-256: 4457539e95314db3af0581ef77484c992278478783a6c17bc0c72371297382fc
font_01_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 11164 bytes
SHA-256: bc742b0ebf77330c0c083927d7aa919887fc347349253d9cfb68888aa549f93e

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