Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fdab346cbd4365…

MALICIOUS

PDF

361.4 KB Created: 2021-03-21 07:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1324b8d627edc27518e6865558437bb7 SHA-1: 91af64cbddf0ce502f3af157c250acdc4b3c82fc SHA-256: 31fdab346cbd4365ce3a80a1e1ec8b624190f940c8ce80165bd6d2f9030340f5
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 support the malicious nature of the file. Although no scripts were explicitly extracted, the presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://jumiwimov.ru/award?keyword=all+chinese+characters+pdf
    • https://static.s123-cdn-static.com/uploads/4446770/normal_6008b599e0f52.pdf
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/toramokiz_rovopetotaso_vumonenikuva.pdf
    • http://kanaxade.mygamesonline.org/marathi_alphabets_writing_practice_worksheets.pdf
    • https://cdn-cms.f-static.net/uploads/4482413/normal_6047fc92548f5.pdf
    • https://zulujiporanaru.weebly.com/uploads/1/3/4/5/134590758/6fcbcb039f.pdf
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/zufagodobup.pdf
    • https://static.s123-cdn-static.com/uploads/4470698/normal_5fe19eb6e3854.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_6024a6e9304c9.pdf
    • https://static.s123-cdn-static.com/uploads/4375708/normal_6003b6109ca25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mefonevimimix/84630584310.pdf
    • https://s3.amazonaws.com/nisoxow/61115150255.pdf
    • https://s3.amazonaws.com/xefezesebusu/61494851035.pdf
    • https://s3.amazonaws.com/xakapudakadu/befebore.pdf
    • https://s3.amazonaws.com/rowubunak/2068916373.pdf
    • http://bopiguxa.atwebpages.com/72741026384.pdf
    • https://s3.amazonaws.com/tizowodifi/star_trek_voyager_uniform.pdf
    • https://s3.amazonaws.com/mekonulegipero/xowefazab.pdf
    • https://s3.amazonaws.com/ganubifirigevi/bezipudefuzenaj.pdf
    • https://s3.amazonaws.com/gogoxowiniza/22491203700.pdf
    • http://sewujajapivix.onlinewebshop.net/71092362028.pdf
    • https://s3.amazonaws.com/telasebisu/osrs_falador_elite_diary_guide.pdf
    • https://s3.amazonaws.com/nigimul/xemokexenafojojarib.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028776.bin
fa877e291d2076d3735b7330caff9a67385c1539ef53c06a789adbce559f7bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28776 233772 bytes
font_01_sfnt_off00052eaa.bin
7a88b21923e67be3469890d742e01e5901ed1f60e1f1d52eeaf3432f5e2360a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52EAA 4912 bytes
font_02_sfnt_off00053f41.bin
dc8aaffe5780428d8ab56b0724e267428aeb041cda67ba10c5304bf927f289ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F41 18248 bytes
font_03_sfnt_off0005739e.bin
d53d347cea387c54c087b2cd85ea94373ed5f2f525a48ba1569850c62da8c160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5739E 16116 bytes
font_04_sfnt_off00058879.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58879 4324 bytes

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