Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bce366fbb5852a…

MALICIOUS

PDF

70.5 KB Created: 2020-12-10 23:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0b24bafd8f7fed8c938ae6ffccc9ee38 SHA-1: 1f1492323be9bd82cec3c2615b5e4bd99781b7eb SHA-256: b0bce366fbb5852a648903eab541ea7ae7fca358c8d3ca14c0e31e9d68ac8a63
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file. The document body, though heavily obfuscated, contains references to 'Acer ed273 abidpx calibration' and 'wkhtmltopdf', suggesting a lure to a fake calibration page.

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://trafftec.ru/strik?utm_term=acer+ed273+abidpx+calibration PDF link annotation
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/7a2ccee1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454425/normal_5fc46d03ab774.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/7106688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5f8a679879c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5f9ac6dfa8072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc06ecff7cf8c75402886b4/t/5fca2bf955485c3109badf29/1607085049997/strategic_management_process_steps_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b27889-cedd-4197-8172-93a584af5476/89227460170.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6562327a199023ada57b2/t/5fc82ae2d6e0cc37e3329818/1606953699096/95789744131.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fc2150eeaf37e3b64e3ce94/1606554895032/forrest_gump_movie_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19a8f40f1034a5caddecf/t/5fc503821972c46e3c3b2573/1606747011185/bigewevesonobozunivinep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703101f5-4615-41d7-a2c6-8dae40cbf106/7399291163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d9273b-7226-47a6-9fc5-7ee7b3755f14/81600950891.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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 5460 bytes
SHA-256: 0d528868ceb246b0dc87aed7299182427db3b9d5da7b97e1f1b7a3e10aa548d4
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 11432 bytes
SHA-256: b70b0564cc5048ef9e38427f6334d2268fddcad6d0bbb7d6eedecb4ded0f4012

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