Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e44610b48f1e18e…

MALICIOUS

PDF

85.1 KB Created: 2021-03-22 11:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 025bd1b1852319e00283526739845d98 SHA-1: 8329ed0c2c3529d5399f0c7d4131f0d82e23e62c SHA-256: 9e44610b48f1e18e1a437afbe050036dc83470e4ca78694b8b748888b241281a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=chemistry+2011+season+1 PDF link annotation
    • http://shoop-fm.ru/73349557295bkuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_600cbbaeb67eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_603e67990e755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fe75ca1446ed.pdfIn PDF document text
    • http://tohld.in/sony_android_tv_remove_appsavkp5.pdfIn PDF document text
    • http://constructionhouse.info/lawewegok403v.pdfIn PDF document text
    • http://gazzsheff.xyz/77371663058zogms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fffd5e64448e.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/information_technology_internship_resume_examples.pdfIn PDF document text
    • http://my-favshope.online/uncovering_student_ideas_in_primary_scienceay3c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_603c35eb86c5d.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/asset_management_interview_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/712610b7-cfc3-45c1-b6fa-68e859cdcec7/how_to_lose_weight_working_out_at_the_gym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a558ab5-b5d7-42c0-938a-54e84e091234/how_to_dvr_on_dish_network_bill.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/examiner_report_igcse_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/59372826587.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_53ed0e6cdb2a4df9be2d08cbfefa9701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/opera_browser_for_android.pdfIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_d994131588da4c329645cea8a6fb239f.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_53b1d98dec8547038d22177c1a8e6122.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5132 bytes
SHA-256: 89c14c4f7210bd0e0171220a70c1cbb69c0d8b316073de015ae355befb04f68e
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 11184 bytes
SHA-256: 87ba5e74a5c69aecc14ba15f2375cee6aee4879f9592d4b854b7cb863e839736
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16448 bytes
SHA-256: 4972c892cf783310df7ebe7a43044f7b4e4d650808add06809858f2f0e6eeb09
font_03_sfnt_off00013851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34