Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d16b3b1e3bca29…

MALICIOUS

PDF

76.6 KB Created: 2021-02-16 04:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5fcd13fe4f6a3f828b510e6fcc64531a SHA-1: 200c85be92e13d7e7fc41ebacd7592bca86a53f3 SHA-256: 49d16b3b1e3bca29c2daff8e4f39e7c185b1a1736d22258d21accea3dc52f0db
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 S3 buckets and Weebly-hosted PDFs, indicative of a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=samsung+un32j4000+wall+mount+screw+size PDF link annotation
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/bulolalizesenedujo.pdfIn PDF document text
    • http://unityfree.xyz/64340019373yd9cm.pdfIn PDF document text
    • https://mumabawof.weebly.com/uploads/1/3/4/6/134634692/594f9bc.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/bokunosetes.pdfIn PDF document text
    • http://karnaval.host/9445371594l1eov.pdfIn PDF document text
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/90f6a385a6cb6d8.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/pegozegi/20888019658.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/jaxamutovurawekutaje.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/98044640062.pdfIn PDF document text
    • http://seguwogira.rf.gd/rhino_beetle_care_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/pudiji.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/jizegarobaranesamune.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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5968 bytes
SHA-256: d3942cb08622c26359ee816f54572d5cf90f081efcaeea7ac60b4e41d9f6ad85
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10696 bytes
SHA-256: 4d2b6ef3aab26fa6fb7ecae09002b5aa8fce94a43c7e60d75366f56639cccb51

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