Malicious PDF — malware analysis report

Static analysis result for SHA-256 4584d8254498c5f9…

MALICIOUS

PDF

66.8 KB Created: 2020-11-10 01:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ca318cb9b207a5d21542f4f61b43e45 SHA-1: 15dec8eb488a7e70634984c94f78e205b17a6b4f SHA-256: 4584d8254498c5f9b580d438152fdb40f364f64ea2e533e8f4737788953ae5cb
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?keyword=worksheet+matching+plant+cell+parts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_5f9fd7b99c69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5f906c299e2f0.pdfIn PDF document text
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/8cbbaf2f.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/4070269.pdfIn PDF document text
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/ketaluxof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f8e09ef3d119.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/fizup/71545784973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f7dd69-6d22-44c0-9fa1-372331700f31/pace_rng200n_boot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9e2bf7-7183-4e82-bd6b-5722d7521be2/amy_tan_mother_tongue_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/reynosa_tamaulipas_mexico_explosion.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gabuxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5bea2b-8a4c-4240-8f2c-b898094b78ba/kadupotafemewelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bcfa0d-eeae-44c8-aaa3-ba640f47ebf0/vuwidopavejixibefom.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 5424 bytes
SHA-256: 31f11f4bbc6dc9eb7388aa1f8fa981d4d5fbea1c80400bfc3c82dd214db1dea5
font_01_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 10628 bytes
SHA-256: c2fcfc3a36ca2e6ccb92698e34753120664f6f17b2d37caa8c576cbd7911d565

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