Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20d83b6d95c7d13…

MALICIOUS

PDF

106.0 KB Created: 2021-03-17 06:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e5c827dadb8c9d6f564e57ed8d90a082 SHA-1: 2056f9555668c49dc6d2760cb4097403e749f31b SHA-256: c20d83b6d95c7d130f9b8290791329a3d637bb7904dc29c262f01e0ca0ffa3a8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=al+quran+question+and+answers+in+tamil PDF link annotation
    • http://vutisonoj.sportsontheweb.net/topographic_anatomy_atlas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_6001116bcf988.pdfIn PDF document text
    • http://airned.ru/1994_toyota_pickup_factory_service_manual9d7h8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_6007194ec94f9.pdfIn PDF document text
    • http://testersairf.xyz/rikadikefewovekaxobkj4lw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_60462a54cf1e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5ffbd8e847420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fca68633cdff.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/72203306401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6021f6efdf1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_604ac6be933e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_603732bb78d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6014a4fc42722.pdfIn PDF document text
    • http://gatorama.site/40282816799dja1l.pdfIn PDF document text
    • http://worldthailand.fun/ics_field_guidesnn3s.pdfIn PDF document text
    • http://zedateve.mypressonline.com/two_step_equations_in_words_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_9ec63a2703a84cdc9228431ebbd61494.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/533295ef-7187-4f70-ae04-87d6aa3fe059/how_long_is_a_club_car_precedent.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_e969a3b75b6c4eea9f90d3ef9c06c340.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_a7ec75e4369746f5991bd2b9df52ed8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d850d88a-fa61-4c86-86b1-a6fb8eba34f0/what_is_stock_market_technical_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3288cf-d016-4925-9c69-7cd2c044b2aa/how_to_be_filled_by_the_holy_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a686f99e-0b1d-485c-a1e0-6be0db8f1a07/dell_optiplex_9020_drivers_download_windows_7_64_bit.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_5a993cd1f4344f82b644b0dda1169241.pdf?index=trueIn PDF document text
    • http://xirexadugimog.atwebpages.com/99848644204.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/13818393941.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001739b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1739B 20844 bytes
SHA-256: c5bf07865a680833775236b2e962449dd062ccc4760948a34f2e5faafcca3d70
font_00_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 6812 bytes
SHA-256: ebfc6ae9101a580b251f18edb4f130d6b8a0a69f7e0152a464433f4f38f834d3
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 5180 bytes
SHA-256: 60c5f50d9bf2b782e866b9fe49048122580746e684814c862aad7aadb1400656
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 6340 bytes
SHA-256: 18237e042c6ee2ef73379cffbfdb72cf6c04e935504d43d9e30aa7cf3c115405
font_03_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 11296 bytes
SHA-256: bb03491ee33fa19805fa6f1455ce75a54abc81941342856e2354954141e6511c
font_04_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 3880 bytes
SHA-256: 6c7c0c4096d2effa709c0207b6fa94ce3b280e196522b5b6b7030fe7c2df4e45
font_05_sfnt_off00014faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAA 10512 bytes
SHA-256: 8b788e21afbb0dcb8654a47b5523c13291bb89d3f70b57083e32b116c5948961

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