Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd480a5bc6c8d086…

MALICIOUS

PDF

78.9 KB Created: 2021-04-02 03:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e2c66ee2d06928ce260b4e8ef77035e9 SHA-1: 9879b735231cfc237c0cc540b77ae77c4c4f412c SHA-256: fd480a5bc6c8d086cfcb62d7caed2128d268a1b8982170aa867c086bab30d262
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to other malicious content. The primary URL, 'https://midufefew.ru/wix?keyword=download+ufc+apk+data', indicates a lure for downloading APK data, likely a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://midufefew.ru/wix?keyword=download+ufc+apk+data PDF link annotation
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/murosezog.pdfIn PDF document text
    • http://bigwin-1xbet.fun/zemitabag98p8.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/4625b0445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5fe64c6193890.pdfIn PDF document text
    • http://kersita.space/vivefaxusuvubeli1ogm1.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/80256959439.pdfIn PDF document text
    • https://banuvexizuji.weebly.com/uploads/1/3/4/3/134387765/0277ddb0a8250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5ff5f41c7a59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_601a553fc50a5.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/8822bcdb92ea.pdfIn PDF document text
    • http://reduslim-italia.website/baofeng_uv-5r_programming_software_windows_xp9u39g.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/dogs_are_better_than_cats_essay_conclusionvfflx.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/c0f633e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojozore.myartsonline.com/mexonasulezemolidal.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_5a55ccd000274eb68d57859b57ae93dd.pdf?index=trueIn PDF document text
    • http://giworutiw.myartsonline.com/79377451715.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_278aad26e10741ba9f3a4790b6046889.pdf?index=trueIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/25126971720.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_e124b5097fca431e93486709bf9ee0c3.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_3b36523a8328425c95d03a310d1ad7bf.pdf?index=trueIn 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_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 5032 bytes
SHA-256: 5485d5c3aee94c4f7c6271edf9aa1ba5323602f96b083af933fbfa2a58dfd816
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 10824 bytes
SHA-256: 70e6ef3361f4b49c543e755487b0605c9601db63bf56ed3bc6570715d6effd1a

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