Malicious PDF — malware analysis report

Static analysis result for SHA-256 853561a9f4c4b4f1…

MALICIOUS

PDF

104.8 KB Created: 2021-03-08 00:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc986b7f3d9c6a5f87405b12c24e6ad SHA-1: 2900a2a0fbb54a7b2ab47e2ba631dae93cc9aed5 SHA-256: 853561a9f4c4b4f1d301e9b65c45fcc09ccc7c737d43c62d9ea64b655906913a
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are suspicious and lead to PDF files hosted on untrusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. 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 0.9987

Heuristics 4

  • 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://vilenefex.ru/123?utm_term=importance+of+social+contract+theory+pdf
    • http://waniruraguxi.22web.org/nanostation_m2_range_extender.pdf
    • http://swiss-gear-top.xyz/federalist_paper_10_questions_and_answers9erel.pdf
    • http://digogipexoluku.iblogger.org/44057698180.pdf
    • http://cardio-active.site/how_to_redeem_minecraft_windows_10_for_free_2020jb58e.pdf
    • http://basiditdcf.space/xuwexalipitifagulopubefu8khbc.pdf
    • http://zenarajare.22web.org/84121908928.pdf
    • http://infonewstravel.com/riviputapaximuemke7.pdf
    • http://torchland.xyz/can_i_put_a_copyright_on_my_website2884n.pdf
    • http://nesobaka7.xyz/740862612307me1n.pdf
    • http://reduslimitalia-oficial.site/duo_therm_rv_ac_partsccjhq.pdf
    • http://naturebiolog.fun/54868982455offc7.pdf
    • http://roskycnmx.com/videos_para_aprender_ingles_basico_gratisx60ka.pdf
    • http://crystal-light33.ru/22342887845490vx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_4da11d4c80c240a6b1fb0a08251c3377.pdf?index=true
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_cc0de6469aac4cecb0a4574c6c6213af.pdf?index=true
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_54998fd632814d0e87f89a1df41dba22.pdf?index=true
    • http://rasezufolob.rf.gd/cars_game_2006_free.pdf
    • http://jidabaseruf.epizy.com/nixadodatunafi.pdf
    • https://70645266-f316-485f-8907-c893ecb8e977.filesusr.com/ugd/12745a_073d5e2d1a3a4b60a66aabee4b6a256d.pdf?index=true
    • http://zemipajobo.rf.gd/counter_strike_source_non_steam_cz.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_435a1959067449f38ab292eec080d3fa.pdf?index=true
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_68b02557adac4bc28004e74eddf5a7ff.pdf?index=true
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_017789c7407548b19eb72c233bff7de3.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_c90c6a9ed78e4d648a9eedde9541b70b.pdf?index=true
    • http://rufizugo.epizy.com/16349625363.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_off00015bfc.bin
3fbda6cd831e37cd6ccb8ebd672fe7647336ee09fb96038b209a13528ab6bc0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFC 5432 bytes
font_01_sfnt_off00016e4d.bin
30c5fb9141851eabd435ca2742baee622e5d9030213839a08bcd63589bf32244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4D 11652 bytes

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