Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7a3e42a80cc743…

MALICIOUS

PDF

82.4 KB Created: 2021-02-14 04:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4525206efbbc3d2072d6e131a75e8571 SHA-1: ad680fa6a2b5b3d132b9d9b4218a98436d60bd85 SHA-256: 9b7a3e42a80cc7433fe24630509c2701d3a7675366f0cea3dab602bb56903df8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to link farms and redirectors, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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 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.
  • 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/123?utm_term=neil+gaiman+books+turned+into+movies In PDF document text
    • https://cdn.sqhk.co/towojutal/gVjg0av/dictator_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/D5higix/renaissance_hotel_mobile_al_spa.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/d69080.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/hcuRjhb/juguxibuwix.pdfIn PDF document text
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/taraw.pdfIn PDF document text
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/memixume_xiparog_foxade.pdfIn PDF document text
    • https://cdn.sqhk.co/gobikazifelo/aCjdjeO/boxing_fighting_clash_mod_apk_revdl.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/9774908.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/iiiheyx/gixomopugulowumifegife.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/ggnXVji/cbs_sports_franchise_football_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/huhiK2e/67427796674.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/henXmot/dental_assistant_salary_rochester_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/Luyiihf/ginitatatafaw.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/aijEjdx/the_chosen_one_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/hiEibzy/police_car_driving_motorbike_riding_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 5380 bytes
SHA-256: f8923f075e29e700ed8439f175c0c62bfb94fc1e7e274ee20c2fb0919cfd02b7
font_01_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 10664 bytes
SHA-256: 0cfe02d8308d6aa682abddbaa681ae670accb31d0a17cbb67f2e46c678cffc8e

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