Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfaeb0ea150c81f…

MALICIOUS

PDF

68.0 KB Created: 2021-02-02 08:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 018a015fd0a446624ac7bc6c81c173c3 SHA-1: f8e14c1d4858025b5a87420357e52bc03ab2de7d SHA-256: 1cfaeb0ea150c81f8e7a42bed37356ef7986cbb4e3c8d6c9ff5f42c7a43a68d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=vans+authentic+platform+all+black PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5fc7c6985b800.pdfIn PDF document text
    • http://vinorama.fun/difference_between_austempering_and_martemperingtax0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5ff68f041f2a3.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/3684980.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/kaxukok/hd_background_images_for_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/17634477146.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/69988613763.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/duvunekidekadugozire.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/80001339301.pdfIn PDF document text
    • http://goseletew.epizy.com/boxoripomezujixelavugu.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/63510190454.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/infantile_hemangiomas_guidelines.pdfIn PDF document text
    • http://lugaderova.epizy.com/meloduvosofuwaven.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/calitech_work_report.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_off0000c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 5424 bytes
SHA-256: ceb08599dcf8c1e0da0b7a18eefd98fc741e28beeb176eb8faca8eda63ecf5fa
font_01_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 11852 bytes
SHA-256: 05ff37b6d8bd37e9761ef6f91ed8a21c06195b72b49eb29e61fbef79748ad57a

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