Malicious PDF — malware analysis report

Static analysis result for SHA-256 855a17533c54043b…

MALICIOUS

PDF

60.6 KB Created: 2020-11-24 04:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fe31f6758319a952771f122844b1e7d6 SHA-1: b9b123b7c76c7d9fa9d89897b017d5e12b520b61 SHA-256: 855a17533c54043ba1a395afcfcfba63ba5a1cbfe34b9e6f43fdfb213a4285f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with a primary malicious URL identified as 'https://traffnew.ru/strik?utm_term=mot+parents+mat%25C3%25A9riel+manquant'. The document body, though heavily obfuscated, suggests a lure related to missing parental material. The presence of external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

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://traffnew.ru/strik?utm_term=mot+parents+mat%25C3%25A9riel+manquant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425504/normal_5fa7db160b29d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f9241b87d9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f954f3dec005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5fb8f9785f370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f89ebd5a7002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_5fa1c01a1deda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f9c5ae4c6dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fb4bed573d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5f8caa24027ba.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/7428022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5f8bbb116917f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f982a9c33f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5f8e4a586b6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5f969563328e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5f98dc409384a.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/bubisifapagefe/template_opening_logo_after_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/effortless_mastery_kenny_werner.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_off0000b172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB172 5240 bytes
SHA-256: ea5a6c705e4e9931447b270a76da5ffd2fecef42ffe89d2d8b9440ba2a5f1420
font_01_sfnt_off0000c2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EE 10276 bytes
SHA-256: eb0851ceacfcf26a855f7bd564cc281cfd1058f1b3998d15d6d8d3b2e398b1ec

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