Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94fa0f77c4175e4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-26 13:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35e7a5212168a611838ed3d18db12c2a SHA-1: 13400cacc1d776e98ab17cc86ad596f4d9d9758d SHA-256: b94fa0f77c4175e4f36bc55ae72d8d28aef9b843f6d84b7b394ee9ae3539e8ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mispuntossaga.com/campannas/file/jumafokizexubukinalizovo.pdf In PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/25138052189.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/jujupagi.pdfIn PDF document text
    • http://generaldistco.com/images/file/16795907214.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630676172706995895.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109090800011749.pdfIn PDF document text
    • https://arerp.kr/data/file///35801499979.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/sorotirojejaniwalotiwolux.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/73452556887.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/79192679082.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/nokidolezusidokav.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/fuduteleb.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109240551096206.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/sotopikiwuv.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/5831436949.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/tisab.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/soxibolu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/304cb049a6d1d7378c4573cfe251bbe5/mumifagekituzususomovig.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/22299989726.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/xovej.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gubaniwozasujemotolobava.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/89877216998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=visual+studio+code+flutter+create+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 16588 bytes
SHA-256: d154be8f41fcb01afeb5803a5df9547a766098b2f5df9cd350b20dc545c86a86
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10668 bytes
SHA-256: 0344dba146eb278b6d4c90effdab3976aff9cb0a5dbced2bb4f2db1ba9f92f94
font_03_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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