Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db38bb499e89f83…

MALICIOUS

PDF

71.8 KB Created: 2020-12-17 19:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9dec1ce79cd9198f8c38541104e1c6d6 SHA-1: 60d9d4dc050283ebd54bede0cd503baf1d36ea42 SHA-256: 4db38bb499e89f83cc470d20e36b15364414ea8ad62ad58e366d043c1a933c90
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a mass of external links, with one prominent URL pointing to 'trafftec.ru/strik', likely a landing page for a scam. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to redirect users to malicious content, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=national+science+teachers+association+conference PDF link annotation
    • https://nasiposeki.weebly.com/uploads/1/3/4/7/134709897/5620458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_5fcd8a9541b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_5fd7bbf24d546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f9f1ea967864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_5fa57f31c4e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5f9889251bdef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fb5f36f817db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8bc046cd034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc067539955c744b5390d02/t/5fc4e5e9eaf37e3b64361a28/1606739434368/49118932288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64afce43-59dd-45b8-ae0f-3571b7f1cb5d/40305039795.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 4724 bytes
SHA-256: 64c47655e0bca3b24d3650e0a9fe48ee0bc2282629a6a231005e4fb682731837
font_01_sfnt_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10576 bytes
SHA-256: cf20675676c18059c48cac025bfbc95a6d7591df1c1d40b06e556122cf1d7c1f
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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