Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4bfd1ed02cfdcb…

MALICIOUS

PDF

78.3 KB Created: 2020-11-23 12:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 724b20df38e74ce3afd7231411826951 SHA-1: 1161dd05b6a90c3ac3d0fc3acb6f67239c5944d2 SHA-256: 3b4bfd1ed02cfdcbafb396ed4104bbe70d5ef1f071e080d7ee57f29911509be6
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 0.9995

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://traffine.ru/strik?utm_term=mp3+tiesto+ritual PDF link annotation
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/3086251.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/49a2375.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/bofake/5052659292.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/osrs_melee_training_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/27748900477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f124ee73-e591-4f7b-8c13-3c1acb1c5589/fundamentals_of_nursing_taylor_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f9dff4-cdcb-453c-b5f1-70c567a53691/bobixurupis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f161ab9-efaf-4880-8c24-dff6c7cfca4e/11507069734.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/barivaladodibumadipebov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec96689b-3247-4c94-b2be-4c5dc5aada11/rochester_zen_center_chants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa72459-0c6e-40a0-aecd-39d88356da50/96175791535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf45f3b6-8b05-4216-a54e-ae6977554e80/22735648704.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 4984 bytes
SHA-256: b8bd301e9b6d50f27e790f81118e6e6fa8128a431d7b7bb03a61e4640b445e46
font_01_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 6236 bytes
SHA-256: 6ba7e86d675080a69edb4463733b599c46d011624050c2396498b2dd6432105c
font_02_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 12224 bytes
SHA-256: bccf485414a231b30a344df241f18b30c3a650cd1a0ccda2a322de75b89387b7
font_03_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 19828 bytes
SHA-256: c1fe35366dea2cd29250de4acd6eb8ab4442df850ffe2324f96311a2ae2d48e7

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