Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbae666425fb725…

MALICIOUS

PDF

72.8 KB Created: 2021-01-08 16:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d8d39f8fc29503aeef0d6ae35a5abd8 SHA-1: 59622eed2db1d423d2bd98b0740014ba375eac75 SHA-256: 8fbae666425fb72502f27b99de00369da6224210dc037d56e222ff4dc7331e1b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The embedded content, though heavily obfuscated, suggests a lure related to financial aid. The presence of external links points towards a phishing or SEO spam campaign, likely using embedded JavaScript to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=financial+aid+award+letter+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370285/normal_5fcd00d74e131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5fe9e20af02e5.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/2323950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fdd3ef079d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_5fe66bf63a37c.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/73bad.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/285e3f0a-72a8-4ca5-ab8b-fdddb4be5d14/vuriposolozexobeloki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a840b1-2624-4179-a80d-57bd4ad10edc/20861129640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd4ba13-5860-4fdd-9654-6b5f027091e9/80041372869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ff18d5-5a33-44f7-95e0-02c92564b144/56050105580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34221236-f528-477f-9455-da57a0488ff4/94898337051.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/child_development_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1a8f4b-8339-460d-9fe6-a7bf6fbc9628/roziwitutalopuwexuromara.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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 5088 bytes
SHA-256: cb2db52e2836d9333e94c1cb240ffddfc66620e0e150009bfacfbe9336f06b4a
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10456 bytes
SHA-256: fa59e076dd61fc7fe314da62c0f5e64e238698f8e27561f7247a4ca59995feca

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