Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db76104ab854ebc…

MALICIOUS

PDF

84.0 KB Created: 2021-05-29 01:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2187c31e43be36a2b672ca7d2f5388f5 SHA-1: 313b6e73ae6e9ce409aee38e729835199e0681da SHA-256: 4db76104ab854ebc50efb87e5f9aee8119db865e3ff464d21ff6f002e55eb9ae
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, exhibiting characteristics of a link farm. It contains numerous external URLs pointing to other PDF documents, suggesting a campaign to manipulate search engine results or distribute further malicious content. The embedded URLs and the PDF structure strongly indicate a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wb?keyword=vibrant%20matter%20bennett%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5feb715d21370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5fdb5ce26c32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_601c974a26893.pdfIn PDF document text
    • https://maminimavuzi.weebly.com/uploads/1/3/4/6/134640728/zekefo.pdfIn PDF document text
    • https://fototinuvanumef.weebly.com/uploads/1/3/1/4/131406749/wuxujugaroko.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/7056b.pdfIn PDF document text
    • https://newakikijako.weebly.com/uploads/1/3/4/3/134351088/f9983997fe5b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5fed69d953163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ff9eb882b933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394079/normal_5ffa94359d25f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_606d4dd00ddac.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/6913963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_601e233a3e028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_60061dfa04675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_606941d70aaae.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/57bb24f601ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_602eba9b7a5b8.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/boberiromoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5ff4c1b2c4469.pdfIn PDF document text
    • https://zitadinenere.weebly.com/uploads/1/3/1/8/131871439/revenugiduti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fee4f64b125c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_60496c431aa25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 5080 bytes
SHA-256: ec7ecce6190a91c022fbff622c7cbeae4c3cd68822539215a720c0a531b1b425
font_01_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 10816 bytes
SHA-256: 3b5b6b8e55445bb4c0c54ef95e708d3f34ca0f17c149e2a93dd19c07561f0c11

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