Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97b8e7e83edf15b…

MALICIOUS

PDF

68.3 KB Created: 2020-11-25 17:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ea52be2cc972a80401886d4df5ee04b4 SHA-1: 115ee38eac09bf0b46d937ed6afce1d0481b0fcb SHA-256: e97b8e7e83edf15bc4a3461d41839a226344494cd44838cd98b1898258250e4f
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-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://traffking.ru/strik?utm_term=human+body+systems+quiz+middle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471236/normal_5fa905f9e15ed.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/gitonavamiwir.pdfIn PDF document text
    • https://bonivodetago.weebly.com/uploads/1/3/4/5/134517527/6317990.pdfIn PDF document text
    • https://legifufase.weebly.com/uploads/1/3/4/3/134349809/2358688.pdfIn PDF document text
    • https://lemurowivavaxub.weebly.com/uploads/1/3/4/4/134404776/06c92eb51a067c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f9eaf8ce19ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fb2d2df0916c.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/d20c2d6d-b249-4ac7-886f-e27aaf0a11c9/xigopadefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/bollywood_movies_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/numeros_primos_lista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062268ac-fd37-4549-9174-916740ca9e4d/essay_constructed_response_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfe1de7-47bf-42f8-a6d2-7e0332f22b0a/splix.io_hack_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3566b428-58e0-442e-b91e-0dca851ccae3/75795245036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7481e1-6a5b-465c-a55e-9404c4aebd34/gugomarozaza.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_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 5460 bytes
SHA-256: 332470e326a2819f815ab6946179b1a4968ef55a95b252fd43e50c4fc9c26066
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 11260 bytes
SHA-256: 23dbafdf69474af11ee131fbbf3a1ad1d8b28efd75e9cdcda9251c291670c066

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