Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c1bee7d0cad404…

MALICIOUS

PDF

77.4 KB Created: 2021-09-22 20:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2db07b45dda3066c05ef8f8ab81d2d0 SHA-1: 3f59e33256c665947aa3d0470de2f42c8e0645e5 SHA-256: d7c1bee7d0cad40440f85a1de233ab7a1882263601e5b290f8dac0a03d91d8c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emirates-offshore.com/uploads/image/file/27855750156.pdf In PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/53867263123.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/rakogezufut.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/31630792161.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210916111406.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/bajagoxejexazevur.pdfIn PDF document text
    • https://jin-ji.com/upload/files/39359545279.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/vepujovukejopegovoja.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jojaronoponalewobodineves.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/pafetixevobonadazome.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/sagorovewisijosabiwa.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/71873957881.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/rasuduxexikotom.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902093659618942.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/rapazotas.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5a44acfd---faxorirogajifojukus.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/61452660594.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/62644030642.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xagufis.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/xusefixozegifowi.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/lufowagobajelus.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/87b567b27bcd534bd3ca1ffa4a4c67ec/nonezebam.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/76099261052.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/zulogexexujiwo.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/58670461309.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/zojafifuvirovozeziwubix.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908130209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=erotic+tv+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 17176 bytes
SHA-256: 1f7719da05619e05ff1e9e9a058f04010658079f5fff8ea158783addf7cf14f5
font_01_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10060 bytes
SHA-256: dea0dbb4709d55a44d50af86ce77af6ab70c2c0257bbadf3d2b2d1a950f2029d
font_02_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1