Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed942c3b22032baa…

MALICIOUS

PDF

64.6 KB Created: 2020-12-10 23:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4714a4ace4d4b2ad903e0636209a7021 SHA-1: db01adb241632cc30f61d612f6d8fd5e88cba475 SHA-256: ed942c3b22032baa78610a61cb911f70276630a557131fcc11249f3eaba8ba21
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary IOC is the link to 'trafftec.ru', which is likely used to host malicious content or redirect to phishing pages.

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/strik?utm_term=lesson+9+3+composite+figures+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5fb34e513845d.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/nivikigexatan-waxodedomo-lukan.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/sufowoloja-wirotaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fa8e361648d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_5fbb6e09053ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fbe190754700.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/sisaxu/advanced_life_support_erc_guidelines_2015.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59af47d0c8f249d60f117/t/5fc80881a6b98126320f0c0a/1606944898029/dimovomipoxelokexika.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/quadrature_amplitude_modulation.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/20433737706.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/boeken_en_bol._com_ipad.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_off0000bd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD34 5964 bytes
SHA-256: 00509718b4919c2d8d8a052d0696318f9120a6add731eb80361f76f72586da5a
font_01_sfnt_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 10596 bytes
SHA-256: 87af68770f45bdd6ee55fd10f23d22a762cc0a2fb9ba97349ec22be7de7977b5

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