Malicious PDF — malware analysis report

Static analysis result for SHA-256 47910dab13d7075f…

MALICIOUS

PDF

67.5 KB Created: 2020-12-18 12:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b993755dbdd4871bfed027d385bb7ba7 SHA-1: 1721f07374a4ffab2ca71b5c2801472488489bfe SHA-256: 47910dab13d7075f01bf393dbbe2389c27427438a219cf72884799ad19ebdc70
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, including one to 'traffine.ru', suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an exploit or redirection mechanism, potentially leveraging embedded JavaScript, to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=frenchtown+elementary+school+frenchtown+road+trumbull+ct
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5f93de4c08140.pdf
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f92932ed2338.pdf
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fa73a3384be1.pdf
    • https://cdn-cms.f-static.net/uploads/4420018/normal_5fa7537155da9.pdf
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f9fbaa6b7c00.pdf
    • https://cdn-cms.f-static.net/uploads/4463792/normal_5fa9c0874eb57.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f87064acdc4e.pdf
    • https://cdn-cms.f-static.net/uploads/4451563/normal_5fc0298597314.pdf
    • https://cdn-cms.f-static.net/uploads/4495042/normal_5fb9b5bd87f7a.pdf
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fb5ce816d765.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/sapekobi.pdf
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5f953d187b787.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefiwegegagu/16926092686.pdf
    • https://uploads.strikinglycdn.com/files/db6273a4-d3f8-4c26-84f3-b2cffe68da6c/6729053583.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ef.bin
ff062df286ff4c0d84789ab79f67a3573e2fe64b062a26865a75e1f8eab581aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 5552 bytes
font_01_sfnt_off0000dcb7.bin
2229fc586bc827f0768a3df5ab7d6d2970a830b615e6869440d81ae30ef96cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 10600 bytes