Malicious PDF — malware analysis report

Static analysis result for SHA-256 3673af33f68b49e4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 11:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 890e68b54138389c34993fa324c13ad5 SHA-1: 72dc4924696c578910b4988a04eed5ecace08672 SHA-256: 3673af33f68b49e4c14ba32d42238a1d500971f5248785aa6fa601fa43680bd1
186 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to external content, masquerading as a game mod download. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with one prominent URL being https://xezojetit.ru/123?utm_term=clash+of+clans+th+13+mod+apk. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=clash+of+clans+th+13+mod+apk
    • https://talebizipuvi.weebly.com/uploads/1/3/1/4/131483067/9546866.pdf
    • https://cdn.sqhk.co/wufotubi/c4epcVA/diwenukuda.pdf
    • https://zejebamusij.weebly.com/uploads/1/3/2/3/132302936/rolibovanatulejomov.pdf
    • https://cdn.sqhk.co/ladesajisama/pjiPwpJ/glowing_live_wallpaper_download.pdf
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/614338.pdf
    • https://cdn.sqhk.co/tabewinudeka/2giCgcM/guide_for_among_us_map_names.pdf
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/9359686.pdf
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/xadow.pdf
    • https://cdn.sqhk.co/tixunadegu/UhgEjgg/57791524399.pdf
    • http://tonedomopoja.scienceontheweb.net/97989692545.pdf
    • http://wivuperafuzo.mypressonline.com/are_speed_queen_washing_machines_available_in_canada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_086eaf6878c545d2a19f0a891ff3e3c1.pdf?index=true
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_cc1369596b4f4f189bb30ed09b12e7e4.pdf?index=true
    • https://s3.amazonaws.com/fupanabivote/puxitujulupujomesinilaze.pdf
    • https://s3.amazonaws.com/zonivezada/ample_guitar_taylor.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_caa8163a8a64424aa6ad4ad3e8012d78.pdf?index=true
    • https://s3.amazonaws.com/poguvelefa/xijejavotuximudekurezo.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_5ca59e57acd6474081474c427442988a.pdf?index=true
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_160abccf7efb47a997e395e104286722.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_ee4f0b5e0d814be885e0f5a9c4758726.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_371a1a158cd24708bd7b2cc75b1af593.pdf?index=true
    • http://wegugoleta.onlinewebshop.net/how_to_use_google_translate_offline_iphone.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_08ac4697dcbf48709d315ae84cd9ab1b.pdf?index=true
    • https://s3.amazonaws.com/kevava/vufefiko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedb.bin
2586d98bc5ffc141228bc78e7b5821b07244a563030d181c368e8e2d2815cfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5484 bytes
font_01_sfnt_off00010161.bin
ab80c4a63f8f0c7a7d770e1bdb4850499d69eb7b1e7b5f8591b834fb6aad305f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 10620 bytes

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