Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ff95ecd579b1c1…

MALICIOUS

PDF

79.0 KB Created: 2021-03-27 23:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fef65028fc344d3c50342daf3d391067 SHA-1: 751f2813add3bffdcd58189e2afc0c08b7896ed5 SHA-256: 40ff95ecd579b1c1239de9e8633b95afa2bd043a50baa80da1384bf8448d1501
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, many of which are PDFs. One of the primary URLs extracted is 'https://soxebez.ru/aws?utm_term=urc+8820+cisco+remote', which is flagged as unknown reputation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=urc+8820+cisco+remote
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/tetolare.pdf
    • http://sosunimepewe.22web.org/nakuri.pdf
    • https://cdn.sqhk.co/zoluxoni/ihhI5om/zuguwudidokevus.pdf
    • https://cdn.sqhk.co/jowapezo/jehbljh/67550693045.pdf
    • https://cdn.sqhk.co/levuzivanu/PibzNj3/48584461239.pdf
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/kebonazolotan.pdf
    • https://cdn.sqhk.co/niwexifa/jjciaP9/best_smoothie_blenders_reviews.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/vasojinamit.pdf
    • https://cdn.sqhk.co/bupewazadufa/hajSuij/mechanical_engineering_colleges_in_georgia.pdf
    • http://zupaxowo.22web.org/cute_calendar_template_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_609dea88f3164d24be5d9929745d0ee9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df31b8fb-56f7-4f5c-8e09-5d0f69d30c20/52766628987.pdf
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_6239badde2b6420093171ab9c93f4cd2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2cf04ec-caff-48b0-a2f9-ba25fe88e76c/28682325380.pdf
    • http://mezuvisudaduvo.epizy.com/14611268182.pdf
    • https://uploads.strikinglycdn.com/files/60f49e39-b522-4d92-be6f-edca107db497/wetunurebenapalimabok.pdf
    • http://xejotapawadi.epizy.com/zumavunibe.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_e4fe0d5b6a8542848e613fbf1d252fdc.pdf?index=true
    • http://dakiwadizadenig.rf.gd/back_to_eden_book_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecff.bin
bae5efb0d7e9cd906accb7253a9d1874b27e0b4af28a6a6a8cdebdfc8be819e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 4844 bytes
font_01_sfnt_off0000fd7a.bin
bb6ba35c095f4a9eb77e8ce0f091fbfdafbead8271ddf1c2cb0f14659d93cfc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10424 bytes
font_02_sfnt_off000120ec.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 4324 bytes

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