Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c3886ee03560a5…

MALICIOUS

PDF

79.4 KB Created: 2021-05-20 15:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86fbfc4470d1aa04b4a686b5ac6e0a38 SHA-1: b31540d30d112b40a9979ad2cb8a43fd52054408 SHA-256: f3c3886ee03560a57de0cda444b95c68bcd352847e723bf8d148aa4bbf06db67
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://pelibifir.ru/strik?utm_term=como+calcular+el+centroide+de+un+cuarto+de+circulo, is flagged as an external URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a link farm for malicious content distribution.

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://pelibifir.ru/strik?utm_term=como+calcular+el+centroide+de+un+cuarto+de+circulo
    • https://cdn-cms.f-static.net/uploads/4475741/normal_606a50bf8b7f4.pdf
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6023f7be1e382.pdf
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/5650059.pdf
    • https://cdn-cms.f-static.net/uploads/4471475/normal_605fed26e9df3.pdf
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fe9c53422ddb.pdf
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/7041299.pdf
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/zotosejevujowit.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_6040bc8f4c8ce.pdf
    • https://static.s123-cdn-static.com/uploads/4384318/normal_5ff5df0eb831c.pdf
    • https://static.s123-cdn-static.com/uploads/4374369/normal_6008962595dc3.pdf
    • https://logavamu.weebly.com/uploads/1/3/4/7/134746434/413dac4c6f6c7.pdf
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fdbd261c45f4.pdf
    • https://jesilezozuzi.weebly.com/uploads/1/3/4/7/134745232/sarubajobutudu_lamokujuvaniwan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gorajikunobixi/apparatus_theory.pdf
    • https://s3.amazonaws.com/dorobukasawituw/zibexisusipew.pdf
    • https://s3.amazonaws.com/foneniz/how_much_is_skyworth_tv_32_inch.pdf
    • https://s3.amazonaws.com/fukepez/relay_for_transformer_protection.pdf
    • https://s3.amazonaws.com/mokixetat/hitman_agent_47_game.pdf
    • https://s3.amazonaws.com/dobikasukavu/fewapu.pdf
    • https://s3.amazonaws.com/lijulijowivaze/chappelle_show_episodes_free.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_off0000f36e.bin
2de0826a0a0e6c8eca00e131c0f0534e2773074572f6aa473546c469751bfb1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 4812 bytes
font_01_sfnt_off000103a9.bin
34deb8d5bbae66b9ac0ba37854f2def5081d2fc6b545ba13c1b130595f1098be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 13108 bytes

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