Malicious PDF — malware analysis report

Static analysis result for SHA-256 18388ec067809950…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 19:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 66c6990063749fd26bb9686fd7eb52f6 SHA-1: e7d564bbf362778c9023a209ca0b6475b1b2f577 SHA-256: 18388ec067809950472a278bd432c01c1675c53832e22a0e4947f3941d59d11d
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a deceptive title suggesting a game-related topic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially harmful content or phishing sites.

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.
  • 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://jacksth.ru/strik?utm_term=how+long+is+final+fantasy+15+royal+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6016ec10a8763.pdfIn PDF document text
    • https://cdn.sqhk.co/jowoluguwoge/cfJjgic/stock_car_races_near_me_this_weekend.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_6010a60b01cdb.pdfIn PDF document text
    • https://cdn.sqhk.co/lenalibuz/gdwqCgj/bisection_method_examples_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/volixusej/f85jbgd/kirunawakibepatixejetosom.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/HSgdhii/stylish_text_typing_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_602deb6065532.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/hbibbG3/world_war_iii_gameplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_f8dbf08016d34a6a917bed2694de47f3.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_11fc5ea9ff9340f697827a4f5afde2b6.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_c14d52099b7c406b8807a7d468fa0a90.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_4b3d6b6cfa724559b510b9bc7c96adb9.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_773e9a72b0124d05a7d1d2cc2eac2de0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/sql_server_2014_free_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/brooklyn_nine_nine_google_drive.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_a463518b43b240b6983837963042aafb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vasofirida/cloudera_inc_annual_report.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_9d764fac2e084a6ea64d7fbf4a751ff2.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_f7373c1374db4a92b9da05985a5e3192.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_3fc371407c3944e1812eaad0b0fe6e85.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5404 bytes
SHA-256: f9dac71c16d2c551cc8bbcbd2a966bf68f2f5cd8f9ccb6e0d2bb3e7e2da74560
font_02_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10588 bytes
SHA-256: 75543e645459ba4f1cd43f2c74047f9aca2824827ac774dbf2a9e49aa4eb7be2