Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b96e62a3f94f828…

MALICIOUS

PDF

60.0 KB Created: 2020-11-24 18:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 426e070e21946595b6b41a7ddfd894da SHA-1: c16d4ead7030d5e629cf35e7ca298b93bac874fd SHA-256: 4b96e62a3f94f828c436b445de969fc12275d209bef0a3dd672b6a2e9a0f86a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a PDF SEO link farm, suggesting a malicious intent to manipulate search results or distribute further content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=west+des+moines+police+department PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5f92490ac0c3a.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/4872997.pdfIn PDF document text
    • https://legifufase.weebly.com/uploads/1/3/4/3/134349809/maxibipusud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_5fad82c051ec0.pdfIn PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/dovopo.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/57e9e.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/148180.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/fedufiporara/foxegotizoxogudivasejasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1e49ae-7f9f-466b-8015-4217c00f197f/83023273684.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/circular_motion_notes_for_iit_jee.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/nezulus.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/83053329545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8e2952-72df-4fab-8aac-ea1a74da4efa/etapas_do_pensamento_sociolgico.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_off0000ae01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 5232 bytes
SHA-256: 258de596b50b64483a81a83df4661823a4fe95dd4068d749549bb8a5dcb51d99
font_01_sfnt_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 10764 bytes
SHA-256: 4e6cf9410c069d59f556ef1381815d07d3871c037cede15e86c75bc33d55b63c

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