Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bae4ed41fcbe32…

MALICIOUS

PDF

38.7 KB Created: 2020-11-07 05:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c659c22737141dff98887b691124d1c3 SHA-1: 53a7a51fd5f5aa268221d1249e5154dabeba4b30 SHA-256: 66bae4ed41fcbe3252641345265295dd26e53ce3accdf9bc108cfc1746efd24e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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.
  • 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://traffking.ru/aws?keyword=present+over+perfect+study+guide+pdf 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/69ef07ef-517c-418a-a495-69fc71b121cd/kumekafimeji.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/riesgos_biologicos_laborales.pdfIn PDF document text
    • https://jowovesopa.files.wordpress.com/2020/11/namodepimalafudakin.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/16205868905.pdfIn PDF document text
    • https://kajebevomota.files.wordpress.com/2020/11/gabusisurujoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8e647e-c332-4d1a-aa30-7e488484fca5/nintendo_eshop_code_generator_no_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/97364531921.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://toxuzan.files.wordpress.com/2020/11/88099255520.pdfIn PDF document text
    • https://zopovamodutu.files.wordpress.com/2020/11/45329342212.pdfIn PDF document text
    • https://nuzobelesuli.files.wordpress.com/2020/11/96332251511.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_off00005908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5908 5244 bytes
SHA-256: 69c0976439172548089053de7c51ce185a6b20a9c6cfa11ade742ce7bd12ca23
font_01_sfnt_off00006b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 9808 bytes
SHA-256: 9569eadac64c28e12bb0de4c2583b6220c5135054e69f4f0d067e69d3a194423

Open this report in the interactive analyzer, or submit your own file for analysis.