Malicious PDF — malware analysis report

Static analysis result for SHA-256 7527d5d423707a65…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 04:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b374c101ba32988574e1b2b15b920e50 SHA-1: 03b8377bac283b48ea1dd0e10ec7af6420902ce1 SHA-256: 7527d5d423707a6599ad30df768800235ea2b3f6d045427b874651e2d6d97fce
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/97791489483.pdf
    • http://twozonechickenlasvegas.com/uploads/files/zivulekenelenitob.pdf
    • http://sanchariglobal.com/userfiles/file/24004062863.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/folaxaworasasebifo.pdf
    • http://abwclayton.com/uploads/files/8571889715.pdf
    • http://ferrogep99.hu/static/media/file/96923230957.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/72011774548.pdf
    • http://klm-co.ru/foto/ck/files/nanifirolatinuwasujeras.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8f1b3e51---13436510208.pdf
    • http://sarigol.kr/userData/ebizro_board/file/55229506387.pdf
    • https://digireg.cn/upload/jilemimazedoxekote.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/13984727519.pdf
    • http://tao-oita.com/admin/upload_filesfile/pibesumagexofug.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/74571348709.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6ea6e2b46290388e96222689d80f07e2/sexefikoranoda.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/fekezebibe.pdf
    • http://oasis-inwaste.asia/files/file/dazer.pdf
    • http://tiyuchangdi.com/upload_files/files/20210908_095817.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/16669860892.pdf
    • http://hzbmsj.com/images/upload/File/sadepiwiduzebi.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/92753249785.pdf
    • http://a-pluset.com/userfiles/valoxasomepujadukasev.pdf
    • http://loveperfectionschool.com/upload/file/tozipotalusasod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=site+related+keyword+tool
    • http://www.thaiticketmajor.com/static/imgUpload/files/lonavoseluvujutowosiso.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://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_off0000e0a9.bin
2aa7b1e3aa4046de452ed4425791337b65e973ac20223baa8bedbf533ce87b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 10336 bytes
font_01_sfnt_off0000f82c.bin
9d32e29a3a8f663a398b2cdaa1a70cefc676c73897c9b2617515842fa9a0aa78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 17076 bytes
font_02_sfnt_off00012461.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes

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