Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0b4d71465bdc1f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 06:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0af023c6f44d27bcfb041958de6873ea SHA-1: e6d6b987fb45e367d4e42c3d233aed02251415a6 SHA-256: 2d0b4d71465bdc1f10a9d8aa294f72e37d25bfc996ecd9409f95bce472e50a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=retrofit+unit+test PDF link annotation
    • https://tyko.pl/userfiles/file/56347108594.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/16662751327.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/22423842389.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133d1915ea7f---tapusetibegu.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/bilet.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/11951214514.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/68028923252.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/wegazefaxatababutobite.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/32145852057.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/25137180378.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/86325282126.pdfIn PDF document text
    • https://kawanmto.info/contents/files/voput.pdfIn PDF document text
    • http://le383.com/uploads/files/44412565780.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/liwebo.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/53158822114.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/kiwixuwekabidupami.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xurosipomijebivogarex.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/nozuwavatanudebagifemof.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupanasumoravusa.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/govidex.pdfIn PDF document text
    • https://cecprint.com/images/file/22120209294.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a43d60e---76503214044.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/67844971903.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 10144 bytes
SHA-256: ec30414a45da3a6614b25ad7b6fad26fac0a6eff3a069fa7dbeafe50eee35ad5
font_02_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 17208 bytes
SHA-256: 46cad3fe50871d42fb353f86d05f908bc5ef1673c753871a9c57683f5785f65c

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