Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b99ef54a382df98…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 12:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de11809b5b63f0ffdf4e69c48696bdb5 SHA-1: 24c982fab69c770ac4f3668f9dd9bd445618ca91 SHA-256: 7b99ef54a382df9857ab660cbd676d39c74d1fec9cd5f18e58a3894f2c667e45
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a website, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the nature of the detection suggest a phishing attack delivered as a document attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=adding+and+subtracting+integers+word+problems+worksheet+kuta
    • http://justamorem.com/ashrae_handbook_of_fundamentals_free_download1fpje.pdf
    • https://cdn-cms.f-static.net/uploads/4476445/normal_600e4391d127c.pdf
    • http://mattelipsticks.site/maths_formulas_download40bzo.pdf
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5ff2c6cc064ec.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://busibear.com/lirojilepizixub4zc82.pdf
    • http://izzzaaa.space/wevavolum51vk.pdf
    • http://itawomen.fun/23176513606skac7.pdf
    • http://centerverifybadge.com/724863974751tx7y.pdf
    • http://blekrossi.ru/kinoxifikedidanovupif7rtq6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_9a4e97ac91004889945c0197007639d0.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_b201eddd6f9540ad8b54955506b86138.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa09da70-5595-4f17-8f17-5afb2262d24b/how_do_you_know_if_the_f_statistic_is_significant.pdf
    • https://uploads.strikinglycdn.com/files/8de59bdd-67a8-4a91-8666-59990e44918d/jemuxanula.pdf
    • https://uploads.strikinglycdn.com/files/fcdb3978-4e00-4838-a1bb-1b91c411d906/riyad-us-saliheen_vol_1_bangla.pdf
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_9f20df7db00e496f948d4370ecf23b54.pdf?index=true
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_6a93725c6c4a473eb3324df4809aeba5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/05e914b7-341f-407e-a0ad-2ff97cda2719/dd_3.5_cleric_spells_known.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f653.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 2828 bytes
font_01_sfnt_off0001004d.bin
c7e41de27bbe06f8f7a48b558453c9718998cdfa8c631e934824f83953b383d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 5772 bytes
font_02_sfnt_off000113d6.bin
3b50711b58b3785ec43293b6028d70506dc373538f27b7df12b277fbd3f40965
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10328 bytes