Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850e2de374f1f19…

MALICIOUS

PDF

93.5 KB Created: 2021-05-21 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d7e0ea5e1f1b34b90cf64e714b02c63f SHA-1: 91eb42183ff7a5e6ff71481639972dc3e75eb590 SHA-256: 6850e2de374f1f19b9f0d3fa24e46b9cfa5493434b8a2b318c5d41a2e47354e3
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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=how+to+turn+on+pentair+mastertemp+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456376/normal_603c4f63b4c90.pdfIn PDF document text
    • https://komeregin.weebly.com/uploads/1/3/4/7/134732401/zuledizilarelofuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_60330ffd480c2.pdfIn PDF document text
    • https://wavadubo.weebly.com/uploads/1/3/0/7/130775728/xosadogawetef-sonikamutefise-daligos-bawotuneleteboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_602d99ca82010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443595/normal_6006e1f1e9b8b.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/8159650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_6007d18d6db3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5ff98a12e0442.pdfIn PDF document text
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/xuritimamabaw-xivadumi.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/xamapebonijos/lomamirugoluwab.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/fur_elise_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/garage_sale_sign_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/basic_electrical_engineering_course_file.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/molevelopemutaranekos.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_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 5080 bytes
SHA-256: 0b506c6c96401c63cfbc7733f5de66cbc80cb50b1b7bca0eb53ab9d197669467
font_01_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 11748 bytes
SHA-256: 706217410bb22f782b0d185a6b78cd9a7affe5d2af72796b5476f39f18d036e8

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