Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccdb66b6daead5a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 22:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf2c7c08a7b3679ca05335fa9473156 SHA-1: d829d368dd5ee5ec12ba780dcfcc0efab4c81687 SHA-256: 3ccdb66b6daead5a8841126750d2d2da0baafed0e72d1e1721e93c66e1fb5396
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or content aggregation for SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=free+powerpoint+templates+2007+microsoft
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/675382.pdf
    • https://nozipukox.weebly.com/uploads/1/3/6/0/136057246/rovikasam-zatuli.pdf
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/mazonoxekimiv.pdf
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/9907008.pdf
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fc6314a7bb78.pdf
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/b81c20b68e7d0b0.pdf
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/nebap.pdf
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/6055f541.pdf
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/jetezanojugo_dexuturaboxo.pdf
    • https://cdn-cms.f-static.net/uploads/4375196/normal_601b9f2b834ca.pdf
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/3a9f6649b86ed.pdf
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5fcdd42b9a6f2.pdf
    • https://cdn.sqhk.co/ritasuxa/jAgdiix/ant_bait_lowes.pdf
    • https://cdn.sqhk.co/nugutobudan/MZjiKgf/favaxanawem.pdf
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/bivowekop_kadesikezamomow.pdf
    • https://cdn.sqhk.co/gevopobi/jzogeZ4/minority_report_full_summary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/22f7b9b2-dd93-49ea-aa10-c2a3c25176c2/char_broil_big_easy_infrared_smoker_roaster_and_grill_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0371e622-6c6e-44d8-be9b-04dae53c1e2f/47536747709.pdf
    • https://uploads.strikinglycdn.com/files/e8ef1bc5-f82c-4dab-97f2-9f5d79e62d7a/34832625652.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f567.bin
93638ff5dc7d106fa097f8263ceb3a5dd6499a235066bb8d23c35bb5b2368625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 5564 bytes
font_01_sfnt_off00010858.bin
5c260bad9e5dd1b6b3bc9efc69da98ffb1504719fddfa702a6d3df81577c62c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 11272 bytes

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