Malicious PDF — malware analysis report

Static analysis result for SHA-256 98db2f387364b98d…

MALICIOUS

PDF

65.6 KB Created: 2020-11-23 13:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2e62807fa37caf47f841c22c321fce2e SHA-1: d7802fd4c2a986f705afcf0c4c628ff0a6aa9dce SHA-256: 98db2f387364b98da8acca714e7941cef5d50a10b0acd8a689d5f78ae39409e7
156 Risk Score

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=advantages+and+disadvantages+of+addie+model+pdf PDF link annotation
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/4371b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fb53b5201cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5f9b1daa30045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5f9ad4a34a2d1.pdfIn PDF document text
    • https://koradafad.weebly.com/uploads/1/3/4/6/134617683/gojitas.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/6e7e9028-f9f1-49c8-ab71-b9c32a1cd9e9/24309412487.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/95082238137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacb34b3-1bc3-4eb7-8825-760abeae5989/xoxerezorotoxinodokuzavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48263336-2a7c-4500-97d6-26d4f0e9cf58/73647037809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2085437-70e1-4366-b8bb-c30b5886a897/90687885928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b92010-ca38-4369-9fbf-b689194ecdfe/warulomizovelumuba.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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 5312 bytes
SHA-256: 74fe85a9392961864755270378505401df473ca2036f28efbb6d28656915e424
font_01_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 10540 bytes
SHA-256: 6d7b8ebc3186968be6b27b85157d892444ae7e7c931815cce9a5362872b84281