Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a066f0a9669cb2b…

MALICIOUS

PDF

67.1 KB Created: 2020-11-26 16:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4f6a4c95223e996a4929462cafba79b2 SHA-1: b7a0dcb4317a72239cdc5b990aab29818122c148 SHA-256: 3a066f0a9669cb2bf83ccf109036b60248b7cbc05ac41b70b65792b92f84e943
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://trafftec.ru/123?utm_term=quorum+ceiling+fans PDF link annotation
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f9e95185c40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5fa0e355e2933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_5f967db914bcc.pdfIn PDF document text
    • https://nerefowat.weebly.com/uploads/1/3/4/8/134856831/c3e9a2bd.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/e4456c73-eecd-4b67-915a-ff3c98401d31/76073621997.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/kofixitemolufenika.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/41495077994.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/fukajurukitatimuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/18901800265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d405ae9-88be-481e-852e-150c9f968881/buledagabidiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/antitubercular_drugs_pharmacology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44ba530-5132-4e65-9969-3b8f762e4f92/jax_jg_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/12486428805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2bd69b-05d6-4f8a-8270-e26e27f7a572/barracuda_load_balancer_adc_admin_guide.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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 5264 bytes
SHA-256: 0bb9942574d4db98295c681b4b1739ac5fd33c91cfee08636f5dc2435098d773
font_01_sfnt_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 10632 bytes
SHA-256: b735b4f3f30f4b9fff7007c0dafdfb1383dbdcfd49ae834209fde9d31902035b

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