Malicious PDF — malware analysis report

Static analysis result for SHA-256 b086f2ed3a005b64…

MALICIOUS

PDF

64.5 KB Created: 2020-11-18 01:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ba109f4aafcdec33ea1beac3b585c15 SHA-1: 5a49cf9f48ee5bee52e277b0ae1e82dc0ef3a8fb SHA-256: b086f2ed3a005b64781e6d02507cae513180650ee9b79848795ae898fb467035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on platforms like Weebly and f-static.net, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'manual flash settings' and the wkhtmltopdf tool, which is often used to generate PDFs from web content, potentially for phishing or malware distribution.

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://trafffe.ru/123?utm_term=manual+flash+settings PDF link annotation
    • https://latijivetazemor.weebly.com/uploads/1/3/0/7/130775002/rivunubuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5f925fa4aa56d.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/jovaregirewegab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fa2723bd1d1f.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/4455232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5faa869d599e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5faf6810df57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8e87dd031c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f87603289215.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/245e0fd4.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/2fc0e339-b7ad-4a3e-bad0-408b64507253/plan_to_eradicate_the_saiyans_1993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd33a682-8e70-4d55-8163-8895eae435bf/75122288486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e5a25f-9efb-4f7d-9950-eab1409cee52/86649221669.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_off0000c352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 4940 bytes
SHA-256: 0214bfb7799e2b946148b0327637c81a2df8e2a28a697f22e52967d1e30c14c0
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 9808 bytes
SHA-256: 6fbaeebb290393d6feecf0e1ff78aa219871d7a239eb994eed539e5865519cf4

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