Malicious PDF — malware analysis report

Static analysis result for SHA-256 529b16c3ab754807…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 23:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54aacd038a31a99557c7d3dc9e7e4f85 SHA-1: 1b9ea78a37c04cc7dea8ce6b170c971aee6e08b9 SHA-256: 529b16c3ab754807dc67e8f43c1c4ca33e646ce73fc4f49b694b1b25c2b3707e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains multiple embedded URLs, one of which is directly referenced by a PDF_URI heuristic, suggesting it's a primary lure. The document body, though heavily obfuscated, contains text related to 'functional data analysis pdf' and mentions 'wkhtmltopdf', indicating a potential attempt to disguise a malicious link as a legitimate document. No scripts were extracted, but the presence of external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9472

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dafemum.ru/award?keyword=introduction+to+functional+data+analysis+pdf
    • https://cdn.sqhk.co/dodirijobadi/c0bieid/btc_price_prediction_today.pdf
    • http://helpcenterbusiness.xyz/possessive_pronouns_worksheet_5th_grade06znj.pdf
    • https://cdn-cms.f-static.net/uploads/4374957/normal_6031bbd330af1.pdf
    • http://olipaka.xyz/resttemplate_add_interceptorqwz7i.pdf
    • https://revevujuz.weebly.com/uploads/1/3/4/6/134678323/visebebe.pdf
    • http://trydouche.xyz/mars_rover_curiosity_landing_videoi10mu.pdf
    • https://cdn-cms.f-static.net/uploads/4411921/normal_604db623e5b50.pdf
    • https://dobumixil.weebly.com/uploads/1/3/0/7/130738680/b134fb0a9f88ef.pdf
    • https://cdn.sqhk.co/goduwonon/d1jb7dA/95180265466.pdf
    • https://cdn.sqhk.co/rixutixim/giZK9jc/atv_mudding_parks_near_me.pdf
    • https://nexijapa.weebly.com/uploads/1/3/5/3/135309594/5329197.pdf
    • https://cdn-cms.f-static.net/uploads/4391305/normal_6041fcf8c2648.pdf
    • https://cdn.sqhk.co/pibepufas/jihb34x/tosivikatifarovibofa.pdf
    • https://cdn.sqhk.co/murofoli/4YWQmxN/wooden_spool_crafts_ideas.pdf
    • https://bebedukiraf.weebly.com/uploads/1/3/4/8/134885496/7929394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e763.bin
f22acbda84320252f58dca2dc0fd94c569b2ba4f4fbbac953bd139c60a0ecda0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5188 bytes
font_01_sfnt_off0000f924.bin
962f2f855b9039f4e8f30e183ddf1971feb256760d5198f565d20d626f607d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 11200 bytes
font_02_sfnt_off00011f8a.bin
66ac70e984b8f27ffb5769c88de5f2cd4e2b098865fb4f5d8b62d04449e8101c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16108 bytes

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