Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ce64b9423a89b1…

MALICIOUS

PDF

56.4 KB Created: 2020-11-06 16:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 681c1ce4b61153db7602f09d3e5268c9 SHA-1: 293113c247e1d7fc16d066436282b6bbbba2e4ae SHA-256: 68ce64b9423a89b10bcf62c4a884b23d257302bb0cfeb458cfebd7e348d25ecd
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://traffset.ru/strik?keyword=maxtor+one+touch+mini+windows+10+driver PDF link annotation
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/1b5650cb7a72b.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/2586399.pdfIn PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/a9931320e40e84.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/neviwove/lesson_8.1_practice_a_geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/jennie_wade_house_virtual_tour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2e8f05-2f0c-4e24-802a-5b2f9625f3fc/63063057628.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/although_despite_however_grammar_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f3080e-f02e-4901-8f8b-6911c7ea91e8/30435092692.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/93799704797.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E01 5568 bytes
SHA-256: afad3c46dffc7d382b4caa8e19ccb7c059fe7b8a6870069d1a382f78e486a24d
font_01_sfnt_off000090e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E0 1648 bytes
SHA-256: 8170fc3fc409a1c0877eb8fc97c1aa6793fdaed6054e537339186737bbbebbfb
font_02_sfnt_off00009923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9923 10416 bytes
SHA-256: ef3c08278d9327ef71fc992cdd2ea9265dd8cf7584023b534022c8f275ac8049
font_03_sfnt_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 16204 bytes
SHA-256: a109d5cc1a8599929bd7702a943337bd153faf2776ff4e30ac39a15e38c17cef

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