Malicious PDF — malware analysis report

Static analysis result for SHA-256 817bf4ad1aac5f64…

MALICIOUS

PDF

40.4 KB Created: 2020-11-08 11:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c2647ec77220a70877f7aaf0b5e443b1 SHA-1: 97312cfd932f109a12c4afbf6ac21a329024f1d2 SHA-256: 817bf4ad1aac5f64137cc9d2d95fcd9d2816b8d7c18d1d67a5a5fe292400972b
96 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffking.ru/123?keyword=medidas+de+tendencia+central+ejercicios PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abb62e3-660f-42cc-a8d1-515c15b4d8f8/geninuvowojopi.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/benedicto_xvi_jesus_de_nazaret.pdfIn PDF document text
    • https://fiduzafitas.files.wordpress.com/2020/11/31053423367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e681f0-b8f1-4dee-b1df-fa19a31a06ac/39499400856.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/folding_electric_tricycle_scooter_199_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/those_who_can_teach_quote.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/96282245798.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/tom_green_county_odyssey_attorney_login.pdfIn PDF document text
    • https://xiwejegi.files.wordpress.com/2020/11/83400921069.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/gujeraz.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/patofisiologi_dan_pathway_pneumonia.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/70982235079.pdfIn PDF document text
    • https://didusajero.files.wordpress.com/2020/11/30312953126.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_off00005d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 5012 bytes
SHA-256: 3ce440618090ad782b652625747aa51cd03d348f7ef4e7391e2603c975c6d6f3
font_01_sfnt_off00006e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 11136 bytes
SHA-256: e986e1e0a2ab86c51ec0dc563ed81c05a7ff00501cf95c8c206574953827a119

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