Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd432dc231ee03a8…

MALICIOUS

PDF

75.7 KB Created: 2021-06-01 19:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73d1484b7b86488ae48755362b36d7e4 SHA-1: 70f6981941f2839df55511bf125e83b75b75e7a9 SHA-256: fd432dc231ee03a8cf38f4cdfdc896cd4896bbc1455e9b71f89a3ce1983ae740
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://queure.ru/pbw?utm_term=frp+bypass+apk+free+download+for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5fecf3ab2d88c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5ffa34fb64640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_603944e8874bc.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/386756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_605d928e48afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_605fbe111938e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5ff0c1381b196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_60262a0d82422.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/tifugojiveboga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_60290e711363b.pdfIn PDF document text
    • https://pobasejedewepiz.weebly.com/uploads/1/3/4/0/134017346/6821c31d88bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_6051ce6243a03.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/ruzexibuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5fcb9ad0b177e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kalunagepigi.pbworks.com/w/file/fetch/144424902/bawanuvi.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418614/what_are_the_best_types_of_coffee_beans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a7d158-6847-4440-a6ac-356c248382ec/buxoborop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d65465-c801-4963-9bf0-12a27e7b0824/calculating_formula_mass_and_molar_mass_worksheet.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/el_pequeo_vampiro_en_peligro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 5096 bytes
SHA-256: 65cf54a29deb3376b4708ba997fd6bf73a72cd464a97ce7376fee732ccbf0a31
font_01_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 10796 bytes
SHA-256: eff9d7f0e9d7e48dea885b2a68a3ce4e00f0c1e5ffe6e27f205ce0bd2b6b36fe
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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