Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8d5d3d6a6f28ba…

MALICIOUS

PDF

69.4 KB Created: 2020-11-29 20:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5baa3a02af7485151601fa0235f390f2 SHA-1: 19f5361b866d27890cfa8ed8b3b65227e2f3b8c3 SHA-256: 9f8d5d3d6a6f28ba096e3afe0063507809bb612157d80902cc80b1d017546165
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://trafffe.ru/strik?utm_term=carta+de+referencias+personales+formato PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5f90a3d1ed92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fbccb55c53c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fc34eff0126e.pdfIn PDF document text
    • https://fufejaxogepevi.weebly.com/uploads/1/3/4/4/134485438/8384849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5fbeac7fd5d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8ecdac98e3d.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/a3deb0dc-fca5-4c71-b4ef-6e671d27199a/hypothesis_for_lava_lamp_science_experiment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddedcdb0-25ca-4645-bf20-385b88113f91/xovasezagomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9c6ba3-c463-4cfa-9743-d26de9aa520c/farming_denial_bursa.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/liver_and_kidney_function_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038c535c-f109-447c-8d35-a84f2d1c4c08/94538792436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db28024b-11e5-44d5-b25b-552fd2281286/the_batman_who_laughs_download_tpb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11f5401-98c1-4586-98e3-3ef15f661be0/fopaliminetogokawo.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 5208 bytes
SHA-256: 3228b4223a77e23e53436b2b9f2bc1d19c948f2a58a3589eb8effaf07db01c30
font_01_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 1832 bytes
SHA-256: 74b1083aee062fa1b6583da8884c1b0e13dfbcbdaede226614c8ea08b57e6fb0
font_02_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 11104 bytes
SHA-256: e07231e0ef497f32a69a5a6ba62e01f3f1035682d30a3f36ed9223b2cca42d3e

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