Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54ceb9e2dd07582…

MALICIOUS

PDF

71.0 KB Created: 2020-12-25 18:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a9ec64ba8bfedbe183e86cd93c4e205f SHA-1: c7a605c85c0c7243df77af3fb2d170282afba8e8 SHA-256: c54ceb9e2dd07582544967a9841a73fcd670c7d2d953364a1ad0b572d8d92354
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'trafffe.ru', indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=perfectkicks+club+review PDF link annotation
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/vutexekadugivi.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/5775378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fd897938c852.pdfIn PDF document text
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/tebowusadoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5fdd0c691b790.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/chjhjhb/mezorimoforasolakelew.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/04489155-8041-4946-a16f-1e40917dc8eb/82289875611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1294c6d7-f1a6-4b2e-80c7-f75ccf44b752/imageclass_d1350_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/stupid_monkey_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5b1137-a16f-42ec-8fb5-db9753bf83c1/92054971729.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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 5020 bytes
SHA-256: 6bb39e681062a40ffa6008413b25e055ccd259f75cb60a320f68c1e86de9d9eb
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10628 bytes
SHA-256: 76b53f05b4bdd20a608217fbaf7c9ee9c5afe95b115dc6bbe8f23bd3795d4665

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