Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6bd1c0e7524828…

MALICIOUS

PDF

68.7 KB Created: 2020-11-26 07:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b7ccd2f5c78f1593e409ac015febe584 SHA-1: 143a3f6516353339e775ac8b541f578cbe434d0e SHA-256: 6f6bd1c0e7524828e3605db4dd5b41884a5bd162ee7c24cd0ce3ac9e0c68d007
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 0.9997

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://trafffi.ru/123?utm_term=fort+ancient+ohio PDF link annotation
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/3993147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f872cdd359d9.pdfIn PDF document text
    • https://tudanane.weebly.com/uploads/1/3/4/5/134596872/vaxexikoxisodixexi.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/jurulobeguvoliloxel.pdfIn PDF document text
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/2385096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fa5c0e55c6aa.pdfIn PDF document text
    • https://xeforosoxipu.weebly.com/uploads/1/3/4/9/134900432/365466.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/f5f49f6f-9588-4ffc-8de4-82f74f4c5509/49615464891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e00790-7976-4563-a05d-c501649927c6/hail_storm_dallas_tomorrow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2829cce9-071f-4a06-a0ff-77f17e69b8ff/21743627940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841bfbd3-f7ab-43fe-8b39-2f1c525f4197/cod_zombies_mod_apk_1.0.11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c4049b-871f-4bbb-b2b2-26f25b105b2e/27283024299.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 4632 bytes
SHA-256: 7b9eef337f92c3354976d12c7547c3a8742de6561b02051a7e4bafce7826cbf2
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 10476 bytes
SHA-256: afe2cd22788781c9bde3ff5cd5a8aa7e1d2d88865c8482b78fdc63ba8bc9e94c

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