Malicious PDF — malware analysis report

Static analysis result for SHA-256 638d0ea503307e1d…

MALICIOUS

PDF

93.6 KB Created: 2021-05-18 02:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 044cf60af6082d8252b0f947a616309e SHA-1: 754f927ad1da7b6ce558ee84b57e543523f148a2 SHA-256: 638d0ea503307e1d750efa0fdb3e76f85a62b63c33443297415fe62b44138226
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, further indicating a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://druttle.ru/wb?keyword=burger%20king%202%20for%206%20impossible PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fcb5d07bc494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_5fdbb13e82b86.pdfIn PDF document text
    • https://kigilepoda.weebly.com/uploads/1/3/4/9/134901239/8ea6fa327f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5ff2f5914a7aa.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/vixakiguzogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_605ab75c075e1.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/zetemi-kaverimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_6041458d76d66.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/bagepug_fobatolefopat_mafipom_lunomevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degefoxovovi.epizy.com/9234246440.pdfIn PDF document text
    • http://minirulo.epizy.com/21961805099.pdfIn PDF document text
    • http://zarixisulepu.rf.gd/82160203800.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/chakravarthy_south_movie.pdfIn PDF document text
    • http://vomalowo.epizy.com/answers_for_clash_royale_quiz.pdfIn PDF document text
    • http://lorabedujeweb.epizy.com/8935793217.pdfIn PDF document text
    • http://pagilupoge.rf.gd/26720086030.pdfIn PDF document text
    • http://rozabakesolunu.rf.gd/86099690935.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/valuturezevineno.pdfIn PDF document text
    • http://zasesubinofes.rf.gd/learn_appium.pdfIn PDF document text
    • http://marivugedada.epizy.com/aminoacidos_quimica.pdfIn PDF document text
    • http://vutevesofu.rf.gd/msi_n1996_vga_driver_for_windows_7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 5548 bytes
SHA-256: 1720cde9431a278436e0622fbbdaa8f9d3bc8ee5b87e10ae9a0dfd61d38ee883
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 3132 bytes
SHA-256: 07827a8c4ad04e91ac0a7e9189aa99add67d09fdfb1832c09bf8dc3d3017f031
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 11776 bytes
SHA-256: c5b40803d5a4ea60d4441432a54584484829b533e2141185e4a8d2e54691b120
font_03_sfnt_off0001518e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518E 16476 bytes
SHA-256: 3627774d184898f38bc432af7128c96cb52f4ca25863144fe478d8d1bb120260

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