Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8f27b5bdf66cbc…

MALICIOUS

PDF

82.7 KB Created: 2021-02-20 05:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f3af1757f18b794e3a0b044457b00d0b SHA-1: c8f0eeadb379dbc8f70580875e013e9b7bbe539a SHA-256: ce8f27b5bdf66cbc7e436565aeaa95a05bb1bd0dd742df92d4537bc8be3c20f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. The document body, though heavily obfuscated, contains text related to the embedded URLs, suggesting a lure to external malicious content.

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 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://jottigo.ru/strik?utm_term=do+ionic+air+purifiers+work PDF link annotation
    • https://cdn.sqhk.co/zoxinugokas/NnJih1N/space_warp_drive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_600173ee624b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/hja04hi/mcat_registration_2021_calendar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370055/normal_60083c2271a28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ff1ae746513e.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/xhijdha/rogue_racing_enforcer_bumper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_601ac0972c2d2.pdfIn PDF document text
    • http://braco.ru/8993862609biuhi.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/hbdjSjb/cardboard_boxes_wholesale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369900/normal_6007de77a84da.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/wewiro/rovekixufololevizigame.pdfIn PDF document text
    • http://genenapukiral.epizy.com/84606957966.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/android_developer_fundamentals_course_practical_workbook.pdfIn PDF document text
    • http://dipijiz.epizy.com/platform_number_in_majestic_to_electronic_city.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/gazodofezasuzivirik.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/rukunidoral.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_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 5132 bytes
SHA-256: 98683a92c7ca54e0ef2ac31e96ba222eac0e72b318a062a2390c595e738a36e1
font_01_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 10804 bytes
SHA-256: 01df25462e6432e7e42c7b39a2c45da652df2ad610d0d38dfe930c91341d177e

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