Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7551b59c96e6c0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-22 23:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dcabb7d154c6acadcfe78ef5e29ecdb1 SHA-1: cb461743253af2659285c2834dbcd13922617802 SHA-256: 9b7551b59c96e6c089eea8dba8eb216229aa995e0dcdc13c2273d08c3713ecfc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, many pointing to disposable hosting services, suggesting a link farm or phishing infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a large number of links on potentially untrusted domains.

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://crophysi.ru/123?utm_term=calendar+template+november+december+2018 PDF link annotation
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/9656075.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/8282527.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/93724466624.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/09dccd1313f87.pdfIn PDF document text
    • http://wewazer.iblogger.org/dusirokaribedumurupixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_6004549beabfd.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/best_health_and_safety_courses_uk.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/pyramid_principle_barbara_minto.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/rs_aggarwal_analytical_reasoning_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fc5a35c3ddea.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/pudiraxilal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikevutu.epizy.com/children_s_day_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae0a890-1836-47cd-a1e3-414bd8b22b10/xegozizegar.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_4649d2b07d324ab2a12407270699a327.pdf?index=trueIn PDF document text
    • http://koxowideza.epizy.com/17931737810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7bc849-24d9-4796-9939-a028e7f909f9/dell_mms_5650_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b763d62-05e7-4d33-8d7c-98bca429cd13/how_can_i_see_my_pc_specs_windows_7.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_361843b631c64c1ea6da97052efaffa1.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_fe0d7c107a8a482eb0db2b3a5639eadc.pdf?index=trueIn 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 5668 bytes
SHA-256: 28bc28c02f5ed0c1449528ae18b1bbd57d895ec4218ff75677c1f943e174be3e
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10684 bytes
SHA-256: 09625cfe71cc396f470f45d976457149a6ca9f038d64462bf68b77089139f6b3

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