Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655c8bd12786db5…

MALICIOUS

PDF

178.1 KB Created: 2021-03-24 20:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a67fd2604b9b44eb1bb7448d9e454d0d SHA-1: 8a0e3dc392b89cf9c2e5a61ffff14e2b9e849c1e SHA-256: 9655c8bd12786db5653f94a0b6cef6575c7a8cef3cc395cc92f7c64f52185483
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 ClamAV and 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 0.9987

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://dafemum.ru/wix?keyword=adobe+illustrator+cc+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fdd4237f016c.pdfIn PDF document text
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/68307c16b9.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/gipofexatuwatovefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_6023c3a30c39a.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/YgcYIb8/balls_drop_baby.pdfIn PDF document text
    • https://bodizolisasutez.weebly.com/uploads/1/3/1/8/131871954/da45f4535919bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6046c6561e363.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/hfjehek/football_league_championship_table_2019_20.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/gehhUhe/wallpaper_ben_10_omniverse.pdfIn PDF document text
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/57fc701c92cf.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/c99a7361-3121-47f0-9f47-f74e73dc4b57/sap_gui_7.60_free_download.pdfIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_c2b65db493a849d0a4f8dc54efeec46c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc498e1e-bbf5-4de2-b333-ef9ffbf98795/gamafiperum.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_a417b27002d3443c81be25c002878ff3.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_10281ee9f9834ef59247d3e66b156ff5.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_053bf922223543318b86d212fe85af89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/748ee82f-12e7-4f2f-a8c4-19ad59fec6c7/which_zojirushi_models_are_made_in_japan.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_b3faab4e7c4b4255bcf07b8cb8e04523.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2f8dd-eae7-4ed7-a915-a722bc5c7c54/nyu_langone_health_pension_service_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb521581-6d20-4b35-b59a-18490dac8b27/kiwurawobaxurinemawisa.pdfIn PDF document text
    • http://wepunulirepobi.myartsonline.com/45245311601.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_off00027d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D6A 5216 bytes
SHA-256: 771da4efdcc8d342d6a2c977ef0cbc8e345f666d257b916a9df5249706f2c06a
font_01_sfnt_off00028f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F0D 13264 bytes
SHA-256: 8cce64a9a34e62b346a74b783189724d6567b1f86a6340b2c6c0a3a4567a1915

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