Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e2bacb895d3091…

MALICIOUS

PDF

86.8 KB Created: 2021-03-24 22:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8657236d90be843ffc12dfcbcc4f488c SHA-1: 2cf49cb4d6a3acd06f3a0de60e38e7cd935bb5f7 SHA-256: 74e2bacb895d309126d7249047e99b7ff60a85467cd2480773c303992c764e88
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a malicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ign+kotor+2+influence+guide
    • https://cdn-cms.f-static.net/uploads/4393188/normal_6027429a276ee.pdf
    • http://rusakadovub.sportsontheweb.net/powabuwanatufitowo.pdf
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5ff0ef1b85b54.pdf
    • https://static.s123-cdn-static.com/uploads/4384633/normal_5ffae95691ebd.pdf
    • https://cdn.sqhk.co/dasupejej/gieFBie/hill_car_racing_hack.pdf
    • https://static.s123-cdn-static.com/uploads/4417315/normal_60069ae482a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5fe713864d9c1.pdf
    • https://cdn.sqhk.co/wupofolizaj/ieWOhcL/23923755653.pdf
    • http://tuforuj.mypressonline.com/java_programming_language_4th_edition_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4367308/normal_60089b184352f.pdf
    • https://cdn.sqhk.co/tugitajusow/4gtidgj/34742168523.pdf
    • http://tufofol.medianewsonline.com/aptitude_test_questions_and_answers_for_engineering.pdf
    • https://cdn.sqhk.co/xeviremal/jWNO1XB/66835001238.pdf
    • https://cdn-cms.f-static.net/uploads/4369309/normal_601245d6f152d.pdf
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff181ef9716e.pdf
    • http://vitofemegawe.getenjoyment.net/hp_deskjet_f4280_printing_blank_pages.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_4f000bd1ec9c476da63f6118dcf80b15.pdf?index=true
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_35982a1c26bb43f6b3ee2b41b61a33a1.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_c8b7801e629b4831a23e5b3cfaf8d5e6.pdf?index=true
    • http://rovizomaguwex.atwebpages.com/22170784959.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_2076db732a1c4fc29a8b1512c4a46dd6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011501.bin
7ad392c4b8e40bc5c403678b7a86260ddfc37e04d02ed6de2171c18eeef9c56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 4936 bytes
font_01_sfnt_off000125eb.bin
be21b6986c4b12d2834de792497bf3a6723150fc8bd4897f4d7f4a8d545eab70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 12096 bytes

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