Malicious PDF — malware analysis report

Static analysis result for SHA-256 49de2b798f01c4d5…

MALICIOUS

PDF

81.6 KB Created: 2021-04-11 01:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 29b0f3bcd1da8e48399f737b83219b05 SHA-1: f0c2e30b5af96fd3feb87962bb6faa7df19a8c6c SHA-256: 49de2b798f01c4d549c9ca6a322c619e2d5117d5efb0bc74fbd8c8741bdd6463
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to 'arc length calculation' to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+to+calculate+arc+length+of+elbow PDF link annotation
    • http://psyhologrzn.ru/g4_vs_g5_jetzm6os.pdfIn PDF document text
    • http://latuha.com/binomial_theorem_booku490d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_6025375111fd3.pdfIn PDF document text
    • http://majerapavigowa.22web.org/99955033837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5ff7cf9ab62f3.pdfIn PDF document text
    • http://worigozuwujuva.iblogger.org/how_to_put_sd_card_in_ps_vita.pdfIn PDF document text
    • http://vupirure.22web.org/lipoxivize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fcf52e7cb14c.pdfIn PDF document text
    • http://naturaleone.space/touhoumon_another_worldapn19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_600ce67863382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5feba40f370ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wupejuxudeg.rf.gd/aditivos_alimentarios_naturales.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/26419543300.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_1bdbd2d6548b44b1bfacac21285983e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/answer_question_of_the_lost_doll.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/71292106957.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/17720967241.pdfIn PDF document text
    • http://bobozejedisalap.epizy.com/44274754284.pdfIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_f8ec3140b1ae4039a9ab297093832f12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/wewipujajamepok.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_e99749011bb8411aac68ce2bc212a3e1.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_479b1d787079412786e7c192c9526bb9.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_34d7d44a6f3b433a945c08fc2b86437d.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 4992 bytes
SHA-256: f711937873210b2e83b8fa17cdd25c1529f8c9b4a82f2388a4308bfa31c5aaac
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10944 bytes
SHA-256: 390f510550c39e4d094d07675b0084e30e2bd6cfe9c167db22b8065452c3f182
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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