Malicious PDF — malware analysis report

Static analysis result for SHA-256 05af15d1a5825156…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbc3c7bf6d14f5bd2f26a8b1ba5b2afb SHA-1: b6bf0da6974475d958fdf271b850f89701e94d27 SHA-256: 05af15d1a5825156b52dbd66c6820c81dffe75541f48d8fe988895a4919a4feb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are structured as link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://archism.ru/uplcv?utm_term=mard+full+movie+hd+1080p+download PDF link annotation
    • https://soportedevida.mx/ckfinder/userfiles/files/4116852384.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/47639155530.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1add784d---15109474792.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/luwijixosipalilapoxazopow.pdfIn PDF document text
    • http://secretinvitation.net/images/files/mabikinapoluwedegu.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/fizokejozusoxogugubix.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/rolafazexef.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/9999155323.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/zatenuxewozeriki.pdfIn PDF document text
    • https://lapakunited.com/contents/files/dojuwinepizenogu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211141873499.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/67920169687.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021830306007.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/bixiji.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/47069274002.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca11d61db8---90227415622.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/53192428930.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77377953875.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/ludawal.pdfIn PDF document text
    • https://pellevah.com/upload/files/lazinopilasikuwavaretadi.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/51171863678.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/ledurefitagimugu.pdfIn PDF document text
    • http://voijin.com/userfiles/files/72194649156.pdfIn PDF document text
    • 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 17524 bytes
SHA-256: 3771a78842da2a093ae67578fc93535e72361fd763a69320b3335a0aae6ecdb9
font_01_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 11124 bytes
SHA-256: cf0363e0ce645a6de94b9e4131581bf5663cd47c39a50c506cb8ceb3d20f1657
font_03_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 16324 bytes
SHA-256: d0c87a521cf0ba99f9b4229d441bb0264544fa336dd41a59efcfe874d4fd3295

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