Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eb1b8443ea7719…

MALICIOUS

PDF

110.6 KB Created: 2020-12-01 17:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5e69403c3b62a9db34c7f75ce871597 SHA-1: bed272c430805774ec922eba5d6cfc297eb98068 SHA-256: e4eb1b8443ea7719a54f6923b31b2ccd7149ca0456b3637e9d407bdaf6e98b2b
156 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 ClamAV and 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=livor+mortis+definition+anatomy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5f91022e49dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_5fb2efd21a089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_5fbde4e8ad0f9.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/nadurumavaronej-movejavep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5fbfb56592f7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc27b7e60f2895dc1f1e23b/t/5fc52993f8cdb769c689702e/1606756756205/bujiduro.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e8cb2bbd74065813b48b/t/5fc39db8f8cdb769c6523e2b/1606655417559/gukaluwuzuwexu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef7672f8b574a0f2036e/1606217591499/family_feud_fast_money_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/12100593099.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0ec868bfc518616a5991/1606225608573/32992474914.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc532e34347c7043ce2c/t/5fc246383570fb44d14d63f9/1606567481195/51372693115.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0805cd49dd12447321748/t/5fc441bf3570fb44d18a2bfb/1606697408235/pmw_300_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/rixefebapinukajo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/nice_guidelines_hypertension_2018_ppt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7c89955c744b53b4369/t/5fc0f1ac7acac6192ae2fa41/1606480301331/bumivuneguxirazap.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/bikojag.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_off000174e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E8 5124 bytes
SHA-256: ba10259e9f5d3871b6f4b03d19272352acb8144ae86f893535549933a1de2b66
font_01_sfnt_off0001864f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864F 11644 bytes
SHA-256: aab7267b3b20490933dd9038cc2c47b7e1b23011f9bd6cb60c575d67f9fbbbba

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