Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0efe1654aeddb2…

MALICIOUS

PDF

66.5 KB Created: 2021-02-14 22:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8bf56d9416c36d91f2e13c37a791ddde SHA-1: 2ec196c500a996a8cd2f4034531ac5f3f1df26b5 SHA-256: fb0efe1654aeddb2bd5b749e10943184f6ee9500bba48b8b018c78840e8aa886
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are identified as redirectors or hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to APK downloads, aligning with the phishing lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=game+no+root+apk In PDF document text
    • http://steblin.pro/chess_books_free_downloadybsot.pdfIn PDF document text
    • http://jalatuxu.iblogger.org/munchkin_bottle_warmer_manual.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/871082231305wqds.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/2741203.pdfIn PDF document text
    • http://xofenejilomoz.iblogger.org/inventory_summary_report_template.pdfIn PDF document text
    • http://life-news.tech/hiper_scientific_calculator_mod_apk_downloadh1zui.pdfIn PDF document text
    • https://subisadorug.weebly.com/uploads/1/3/1/6/131637552/2803493.pdfIn PDF document text
    • http://srakan.space/cancer_research_uk_statisticsyg6fh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5fe48e8fb1b0e.pdfIn PDF document text
    • http://kpupnov.pro/mulolawoputuriterub10r20.pdfIn PDF document text
    • http://davufemalolaj.iblogger.org/66700289875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_6006d75a7928c.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/juvetaso/samarubedekigeg.pdfIn PDF document text
    • http://zubeleboju.epizy.com/yahoo._com_application.pdfIn PDF document text
    • http://nabavewixetutax.epizy.com/51149739768.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_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 4848 bytes
SHA-256: 2dbdb596b8ce093098252ef129ddfd4af0376ebd4f7eb871a8de329ff8e02024
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 10124 bytes
SHA-256: 4538b9457a7233f519fa65e161bcd64a845700296f4e028bf97cb6b30fadec1e

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