Malicious PDF — malware analysis report

Static analysis result for SHA-256 be66dd9723e6bc17…

MALICIOUS

PDF

111.2 KB Created: 2021-03-14 09:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e0086013027ffd9139e654a93f588c54 SHA-1: 554ee651265ca0e8c97928fdd41ca1ec8a6b10c5 SHA-256: be66dd9723e6bc173c6f1562a1e834bda7fe80b0298ae19082b85b81f90413f8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'kuzutuzo.ru' and a keyword suggesting a lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for malicious links. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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://kuzutuzo.ru/award?keyword=gujarati+alphabet+in+english+pdf PDF link annotation
    • http://qunit.space/dd_5e_archfey_patrons0ka3u.pdfIn PDF document text
    • http://milktree.store/253876751054x4ay.pdfIn PDF document text
    • http://zinularurupokim.iblogger.org/wallpaper_samsung_a30.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/bggjfhI/lexud.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/1hdYghz/38068793762.pdfIn PDF document text
    • http://hyipinvest.site/mapleroyals_bishop_leeching_guideirtup.pdfIn PDF document text
    • http://kyrgyztours.com/abas_ii_scoring_tablessqtlo.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/fijuIii/fovetaz.pdfIn PDF document text
    • https://cdn.sqhk.co/semoxumid/iI2jgwN/votulonuzomeveledavuxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/gdAVzh4/koa_radio_weekend_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/Pjeugjb/4719479897.pdfIn PDF document text
    • http://budonap.iblogger.org/scrivener_similar_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://risitikavaj.rf.gd/46888861208.pdfIn PDF document text
    • http://gexazavere.epizy.com/vivogulafinapis.pdfIn PDF document text
    • http://vokaraw.epizy.com/what_is_the_dewey_decimal_system.pdfIn PDF document text
    • http://vumafovixono.rf.gd/xedukatazevoviputujuluni.pdfIn PDF document text
    • http://wowadowir.epizy.com/ti-83_plus_calculator_online_use.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/douglas_lake_fort_collins_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dba806-015d-4ecc-895c-5281c003c1c7/sebixukezinuribujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398bf293-4579-4b52-b1bf-1034bbbdbe5e/povosanuliwunojomipik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fef902-49c8-4c23-9c8a-49b2e89bfebf/pazosam.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5548 bytes
SHA-256: e6a6847dd4ae81273d90b3cc154a9440730f4e3d846b8bab8bcebdd1ea90df4b
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 3772 bytes
SHA-256: b850e935aaf604f3e1824861b6c46746957ce6d0e1401f4bf16d070b42224529
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 13820 bytes
SHA-256: 620170d516c3277860e84178ee229d1b9666bd7d83991ae65831f0494e4c4f0b
font_03_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 2768 bytes
SHA-256: 25c6314f5f576a24f04631ec298dace8b173813e079b54fe58c1e1fc22a6515d
font_04_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 14140 bytes
SHA-256: dc273b236ed72670287b9600490c3940c08a6af6e4f3d9f72b2fc362edc515be
font_05_sfnt_off0001701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701C 16088 bytes
SHA-256: 03928253ee2cb1fef248e02a9a6434000674c6c2dfc7f61f5290e699cd36adc1
font_06_sfnt_off0001850d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1850D 12816 bytes
SHA-256: 7aa779a817ed8b1b714389bc87b651214e4af6abce370cc6c39c12ad0f7ce453

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