Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b71cc7f1187644…

MALICIOUS

PDF

65.1 KB Created: 2020-12-09 15:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6181cb31eb4f6894149f300648a73c96 SHA-1: dff748a2092af4101831711209690323acc2b123 SHA-256: 06b71cc7f1187644c686a7de4955ae7bc3eb58bef77d1d5dc6a4ccbb82fda2cb
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://trafficel.ru/strik?utm_term=period+repair+manual+second+edition+pdf PDF link annotation
    • https://mekujukoner.weebly.com/uploads/1/3/4/7/134715553/lajamevunepujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fa8158e5769c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_5fa1735943589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fa1094e7bdb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fcf229ab2e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f9378f3b1a42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5628c51e-249a-47e3-acd2-0c1c7db9bc53/losofiretow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a035e59a-e541-4a37-84b0-df471c60e448/jipanaz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd2c30b6b03258f2f7c3b/t/5fc3bfc9f81c9a2a0c145dab/1606664138219/gta_5_online_hacking_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/49403278599.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc368199955c744b54b807d/t/5fc4e6f5f81c9a2a0c3c4c8b/1606739711518/manual_of_arms_m16.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/deniti.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_off0000c351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 5300 bytes
SHA-256: b48401b576487fb8601f58576f51405ac0a8ca3c871293d73462bd88836d0031
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 10112 bytes
SHA-256: ba64b2fe6ff9c507705ee05d9688a70b2a166ae8e9d2f69b85dae44af6aa5059

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