Malicious PDF — malware analysis report

Static analysis result for SHA-256 687604fd0d077644…

MALICIOUS

PDF

38.6 KB Created: 2020-11-09 10:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 899250026a8d5fd9b37127760e7fc8a0 SHA-1: 5a91fe5cc91d8f772e774cd70d6f81775f7d0b5a SHA-256: 687604fd0d0776443f8a010961604e6a9277fcdc169bc17d8cc49bb766ee7473
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://trafffi.ru/123?keyword=p1299+ford+edge PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potofaw/grammar_learning_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6ea881-7a50-404f-a6ef-526226e62f19/xudotupozewowokenafamama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292ba48f-4053-4eb0-a6ea-1316a87e79c3/lawotisojawowu.pdfIn PDF document text
    • https://pefowenise.files.wordpress.com/2020/11/lifafewoxajafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f4a809-7318-4839-8f45-49ca99c4423c/52449519761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f0935d-62db-401c-984f-ab1862b07713/71733037751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f41272-36ac-4525-ae92-163872ed9808/99894625461.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7899fe5-00b7-4566-8368-ec0596a186b2/trig_substitution_integral_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba58abfe-3e4e-4332-b3a8-e15ed65180cb/gatedubaguzatibopavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca99d3cd-9a46-4580-b3eb-f52009725836/dirogalatitirararabukapi.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/jofuwumirebebafekina.pdfIn PDF document text
    • https://samujapu.files.wordpress.com/2020/11/14602588560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1fb153-f630-40f9-8bb1-7a4b2de17a02/vuzakubige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97695bfd-97da-4723-8f98-ac3ec63920f8/surface_area_of_spheres_worksheet.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_off000059bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BD 4996 bytes
SHA-256: 296183b5cb7f1a0dd57da172e46672186c7c33dd38d3488c515f95b2ebb067e0
font_01_sfnt_off00006ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD8 10184 bytes
SHA-256: e8550f87a760fa49c055a900eaeddd39be85b36a6e62eed4d7cd9358c241cc8e

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