Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a6d166ce8138f0…

MALICIOUS

PDF

68.8 KB Created: 2020-12-19 15:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d7d108b108b6a9a22f2f0d1d14d6b2d3 SHA-1: 004c3a5d48aa59aab724b24c9ddc77f8f67655f9 SHA-256: c8a6d166ce8138f078f0f4e41385d9b22364c2a73bd2c731995a498f2accef2a
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=cancellation+of+contract+form+real+estate PDF link annotation
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/5754025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcb5ddc2204d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/897bccab-150a-47b7-9256-457f393bc5fc/burnsville_elementary_school_burnsville_wv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7880bf-4186-4a45-8011-3e2ae2e831d5/tubo_de_pitot_ejercicios_resueltos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1129368612547ed5f20ea/t/5fc235563485235c86108782/1606563162216/thidwick_the_big_hearted_moose_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/fractions_to_decimals_worksheets_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d137e1-4549-4995-9904-f5ccc57d1ba2/how_many_calories_do_pushups_burn_up.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/29393068985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c729d53a-3b0f-4564-9842-e7ddfce76580/25871673221.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/prokaryotic_chromosome_structure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 4836 bytes
SHA-256: 173db7352730550c8dbf5128fe69c1df41cf8a8d0e9489162f7692741815cbe8
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 9956 bytes
SHA-256: 75a084ac55718383f028f36e4dbeb4a4f2ce32d27205e05c22576e4f0d92c3b3
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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