Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8619972db9a6cbb…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 15:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00736f7fe0520ad04d1a597e454695f1 SHA-1: daaf5f09274423379781b239ae8fe83dedf62d08 SHA-256: e8619972db9a6cbb60e2583cb2af5c16619f404f5dc3e75628aa776b41d8e0ff
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, forming a link farm designed to redirect users to other potentially malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'Chrome flash player replacement', likely a pretext to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/wb?keyword=chrome%20flash%20player%20replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fd1bc8ddb68f.pdfIn PDF document text
    • http://xidotamasaw.22web.org/29114559877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fe1edee340b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hfjAgjM/65363308900.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/kichdhc/boxing_star_game_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/d7hcjcR/nfl_sunday_ticket_cost_comcast.pdfIn PDF document text
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/bezavuriregimotemu.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/1916291.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/0igYh2U/mobizen_screen_recorder_hack_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fcc5f9fcafd6.pdfIn PDF document text
    • https://cdn.sqhk.co/sesedazaw/yjf3xHf/download_video_from_tiktok_web.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_6032b81177eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_5fdcaf3ecabcd.pdfIn PDF document text
    • http://jelabenix.22web.org/subject_and_predicate_worksheets_for_7th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_600ef497de4c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/684d2319-4c8a-40e2-8278-e24a938ed76f/introduction_to_machine_learning_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171bf8d6-ba64-4fd2-8c48-914c83140230/what_is_monitor_explain.pdfIn PDF document text
    • http://nitiparavedo.epizy.com/esl_library_conditional_sentences_third_conditional_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86c3b08-528a-4b7a-985e-9c6829154c3b/85840694218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ed4522-95a9-47f1-85bd-7b9399b512c7/windows_10_shortcut_maximize_all_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d41acc-63e7-4a46-adda-a0a6bf26d3f6/94673583276.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_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 5260 bytes
SHA-256: f25a97708f2b6888d62431044a5f9ab8e9d17be68f73ed12ce42d15e755cfb5f
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 10816 bytes
SHA-256: 3041ee00a9e61eaefbd6cf0318b08b5c49b2745ec1d2fba39aa66673bc5712e8