Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b4bc9e0861026…

MALICIOUS

PDF

73.6 KB Created: 2021-09-26 02:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 674d92035254ab676966d044e14f7064 SHA-1: 0cc0fd4f379a3d98e206cdcc8e7c45382dba1398 SHA-256: ed1b4bc9e086102639f4c7cf5bf612200f8b0135ebf584d429d43a4d3cd6cd2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. While 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 0.9985

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://synerhu.ru/uplcv?utm_term=anjaam+pathira+full+movie+with+english+sub PDF link annotation
    • http://abbeloosschinkels.be/userfiles/file/55173256673.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/69595515264.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/53102031609.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/zafuduzawapi.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vuwokadije.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/43364770388.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/20612398964.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/10758883190.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/zakobatuwojupu.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/rusexoxogubetadutaza.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4c6b98889---84382157691.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///bagineb.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/73682868370.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/biwanefadedujiw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a17cb35af---59892296055.pdfIn PDF document text
    • http://dgkno.cn/upload/92146929749.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/digamajatinu.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/jubura.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/lorobobironujatamemuno.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/foriroduwapivubagije.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/bigesusurajenobe.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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 11308 bytes
SHA-256: 0d676f90b9bbd265543120804213ff21d2796f566db93acc6780fd01a7e6ead5
font_01_sfnt_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 18444 bytes
SHA-256: d7400493c82848f8f8e8c690fb9b272d8d824cc81a5b071993e93850b2418344
font_02_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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