Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb44b127c8a4e8d…

MALICIOUS

PDF

65.3 KB Created: 2020-11-12 15:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1bb7a017be64077ea38db5597c11e048 SHA-1: 2b199a4dc7164f76386f98ebfaf6ecfe98a5b0ef SHA-256: fbb44b127c8a4e8d25d328e1f32c99d9b2344fe21e18a74c7b4dc61c3bed47ac
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 0.9998

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://traffnew.ru/123?utm_term=379th+bomb+group+ye+olde+pub PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5f953da0ca807.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/rilejovogavagikiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_5fac5f7eb4b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5f9b3178e2ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478947/normal_5fad3992aa0d9.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/vasitusazif.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/bfc6f05c-39b3-4948-aad5-ba307d499c93/digital_lighting_and_rendering_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658157b7-28d7-407c-9049-939bafec0eec/denabefifexidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed380a7-4bc3-4e78-b1cf-d55a71efcdc9/64740765451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32cdbe2-ee39-4015-bd34-62b0e5605afe/51218966468.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/zudixamigeso.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/fabufajuv.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/muxobirezuzelubulobepewil.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/rmc_sport_1_streaming_vf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7d8db1-6ee5-4f55-b698-2fed2a0602b9/gonixopan.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_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 5532 bytes
SHA-256: d7abdf33e088e14c4a2a3d8c1fa7896744aa8fa915ae33f6f3bba67ad8adb36a
font_01_sfnt_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 10124 bytes
SHA-256: 80df1f3cad0531228a646149b469cf43c8b855c787b76fb0c56e885b428c8c6f

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