Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2bb1f53d004991…

MALICIOUS

PDF

77.8 KB Created: 2021-04-11 20:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 717dd8d6fbeef5a0564e32abc57aebd2 SHA-1: 9f425ba3afef8fcca247ecafe8b5f1cd32f6ad28 SHA-256: ea2bb1f53d0049918d7cb6976431a6f58c28d13e6ce8760ad3f23ac0ea1bee5c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing campaign. The presence of a download button lure and the ML classifier's high confidence score further indicate malicious intent. The primary malicious URL identified is vilenefex.ru, which is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=is+the+maze+runner+3+on+hulu
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5fddac7421669.pdf
    • https://cdn-cms.f-static.net/uploads/4482645/normal_60495d8a63495.pdf
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/pesexadofoduworigaz.pdf
    • http://wokadokifoxesav.22web.org/pewiwewolu.pdf
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd2762c17d30.pdf
    • https://mufepubawitig.weebly.com/uploads/1/3/4/6/134614790/toboxaruwuzejelokigu.pdf
    • http://semazolowogafoj.22web.org/62204924805.pdf
    • http://vukabuv.22web.org/bissell_turboclean_powerbrush_pet_carpet_cleaner_2085_manual.pdf
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/kosevase.pdf
    • http://topagut.iblogger.org/plane_simulator_3d_apkpure.pdf
    • http://nobadunitedowa.22web.org/zabawimuxeloxan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/buwosevax/humira_prescribing_information_fda.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_f41a8a551181473f8245b245a2d05243.pdf?index=true
    • http://jexaxotowakim.rf.gd/sawumedovojesoxilisud.pdf
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_a64ba08c8def463eb380315f6f0776ef.pdf?index=true
    • http://ninovaxabax.epizy.com/barbara_barry_bedding_sheets.pdf
    • https://s3.amazonaws.com/juzewojavomofew/free_sony_vegas_video_intro_templates.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_fb917e41c44e4f69bb63d2681f8f1e52.pdf?index=true
    • http://gopudagob.epizy.com/gw_basic_language_programs_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62b.bin
2e14bda8ac398bc51b007f0895568ae9a6fd619e39142fb268fe3e0897d8cad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 4912 bytes
font_01_sfnt_off0000f6b3.bin
c667fc1d5180e38d84a6b39ecc5e50af28ac59a107bb2289b883c9b76cd8c8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10868 bytes
font_02_sfnt_off00011bf7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 4324 bytes

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