Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cdf4b5cd868de3…

MALICIOUS

PDF

70.8 KB Created: 2021-02-19 19:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c988d206e9845d34afef7849f255cb94 SHA-1: 9cce47db2f5b246a191de2267cc94a32f376924c SHA-256: b5cdf4b5cd868de3e73316fdc78be1c33d9849d930ad85fb9f301fa309368c5b
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain. Heuristics indicate the presence of external URIs and a high ML score, corroborated by ClamAV detection as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to a 'sheep brain dissection guide pdf'. The primary IOC is the external URL, which is likely used to deliver a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=sheep+brain+dissection+guide+pdf
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5ff1df4bf1049.pdf
    • https://cdn-cms.f-static.net/uploads/4492915/normal_6013c39998262.pdf
    • https://static.s123-cdn-static.com/uploads/4463560/normal_60027dd10fce9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sixenogafopoj/introduction_to_artificial_intelligence_course.pdf
    • https://s3.amazonaws.com/zomuzigo/bevelul.pdf
    • https://s3.amazonaws.com/tamobalasu/seduvotuverus.pdf
    • https://s3.amazonaws.com/bulozor/kiregexejenuwotu.pdf
    • https://s3.amazonaws.com/gusule/41678767189.pdf
    • http://zuxulabawiba.rf.gd/joxusilepatududutid.pdf
    • https://s3.amazonaws.com/zamemigojat/40133505766.pdf
    • https://s3.amazonaws.com/gajakelegeza/dental_cv_template_word.pdf
    • https://s3.amazonaws.com/vutame/login_html_template_free.pdf
    • https://s3.amazonaws.com/vavabi/xititekemam.pdf
    • http://xewabilema.epizy.com/windows_10_mac_theme_free.pdf
    • https://s3.amazonaws.com/tajimipojimo/82445116783.pdf
    • https://s3.amazonaws.com/takebemanijewok/54846131293.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c2.bin
9e8da6dd59e93bebc63b78a84d501257f8244bca6e3b4ad16bd47314f09de51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 5628 bytes
font_01_sfnt_off0000ebda.bin
f855d77eff0d53f5305d40d7d6ff64f027e121b502503813cb473feb83cabf46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 10064 bytes

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