Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d55028bf6a099c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-02 16:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 77eb8afab3d794f839781e3e422fd84a SHA-1: dbcc530ee7c42d2bed16eccd58d24bc69b22df9d SHA-256: 79d55028bf6a099c8f818b9d71067e75e4e7eaa3da4a23c8fb994ba0058e07cd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one external URI that appears to be a keyword-based redirector. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of many links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=banner+of+the+storm%2527s+eye PDF link annotation
    • http://zejijinaw.iblogger.org/how_to_draw_male_body_proportions.pdfIn PDF document text
    • http://buybritishcat.com/reportajes_radiales_ejemplosl5fvq.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/antietam_battlefield_map.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/jfghhg2/zee_tv_serial_wallpaper_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5feb50b970134.pdfIn PDF document text
    • http://boost-store.net/english_conversation_learn_english_speaking_lesson_173l2af.pdfIn PDF document text
    • http://podeves.xyz/how_to_disable_bug_report_android5r1jl.pdfIn PDF document text
    • http://instapriz365.site/uniden_dect_6.0_batteryh7vfu.pdfIn PDF document text
    • http://kijorifoweb.22web.org/pevob.pdfIn PDF document text
    • http://creditreportus.info/539305525359efw1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_6020638a74968.pdfIn PDF document text
    • http://bavolotaw.22web.org/zubovizopogelapizoxemab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_6001666c4a311.pdfIn PDF document text
    • http://skout.tech/segam5cldl.pdfIn PDF document text
    • http://urro-hu.com/sazuxokunode6735p.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ja43Qgj/granny_square_blanket_border.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_600946b1ee0ff.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/gj22L3m/52919027708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepojofugag.rf.gd/appium_android_tutorial_windows.pdfIn PDF document text
    • http://fufibilola.epizy.com/airtel_4g_configuration_for_android.pdfIn PDF document text
    • http://mujijebal.epizy.com/icelandic_mountain_guides_sales_lodge_in_skaftafell.pdfIn PDF document text
    • http://zerujafulo.rf.gd/browns_2019_schedule.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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 5160 bytes
SHA-256: 7bc9f36a64fb5b3994341231f3e78de5519ad8b76e40c1152270ad3f88f67550
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 10192 bytes
SHA-256: 062a2f640fe46950a632773b45b7103a4e2302075830482dc5178c093e78e9ee

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