Malicious PDF — malware analysis report

Static analysis result for SHA-256 3611443011a499b7…

MALICIOUS

PDF

72.4 KB Created: 2021-03-07 04:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 83b1e9f28b3f90c1dc06bcd6bc1a3c95 SHA-1: 132a9e8175cabd99b168e7ee094a3d2b53597ef5 SHA-256: 3611443011a499b71b2ebc11f9e89db8284aa42e574408b93ad32f74882c808f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=how+to+plot+multiple+graphs+in+mathematica PDF link annotation
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/xejikaz.pdfIn PDF document text
    • https://kaketoxemi.weebly.com/uploads/1/3/5/9/135989659/xutaxirivomovinu.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/fsdwU9b/the_wolf_online_rpg_simulator_best_skills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ffd538a8b19f.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ZSnRVQN/factory_reset_beats_studio_3_wireless.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/hgBhi6l/best_design_blogs_2019.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/8986262.pdfIn PDF document text
    • https://cdn.sqhk.co/lakodatoli/7gh6UnS/clash_of_civilizations_meaning_in_urdu.pdfIn PDF document text
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/05942dd5216eed0.pdfIn PDF document text
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/2022106.pdfIn PDF document text
    • https://waporutonopira.weebly.com/uploads/1/3/1/4/131438234/763b3c25679cf1.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/ibUVHBp/emergency_buzzer_for_elderly_for_sale.pdfIn PDF document text
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/warar-milegubovox-xufera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_6005ecd9268a4.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/uihhiib/35496674754.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/9243172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_5fe642a20882f.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/4bc17cae96eb3c9.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/dhirivn/pixelmon_mod_download_tlauncher.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/1cd51b8d-1eb5-4930-8b7a-eea302a6042f/cinderella_play_script_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4081112f-46f6-4222-8a82-326f009da219/90179296739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4506ddb5-4cc0-4bcc-870d-f05070baf873/24250333046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df5e982-f667-4946-bc63-e670dcff7c36/pixizivano.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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 5400 bytes
SHA-256: 22d10259422a46d3fd01a0d9c885792c21e8fcc768bc03bed2588ec7adfa2fbe
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 11252 bytes
SHA-256: 07ba231d655d84c899aa2a1da09a7e8ae0c92a663eeb3fe424effa6bd4e37506

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