Malicious PDF — malware analysis report

Static analysis result for SHA-256 f112110d1243d943…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 11:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c0e52cacd551daf3e0a1b9f756edbd81 SHA-1: 9debdd7f431a396e8ce3dc09d3045075889f9390 SHA-256: f112110d1243d9437a7715f5bd84a15e98d685640ee3ec0d1ef88044cc381e41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, likely to distribute malware or conduct phishing. The embedded URLs, such as https://irlanc.ru/uplcv?utm_term=yugioh+world+championship+2008+cheats, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=yugioh+world+championship+2008+cheats PDF link annotation
    • http://tns-china.cn/editor_upload_image/file/72943664667.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/fozomironomofukurib.pdfIn PDF document text
    • https://fasaac.org/temp/files/zorapasa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1444398b3---54136171560.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/80304364613.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/xizesuredojif.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/larus.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dugodonuwidosulitovuw.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210901_59A42636B8DB1197.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/63772229641.pdfIn PDF document text
    • https://eniedu.com/data/file/20210922023806.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///40294168078.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/66461077008.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vixirovimupamukevipe.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vudejato.pdfIn PDF document text
    • http://innotack.com/userfiles/files/39651806228.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/37138909353.pdfIn PDF document text
    • http://mamitobe.ru/files/file/jurazisajoveg.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902232427.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210918182637.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f8626d84603ce5e5a3a7f8428791a02e/kobavugafosemomufogew.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/45995272993.pdfIn PDF document text
    • http://ashioke.com/images/library/File/74047966781.pdfIn PDF document text
    • http://exima.kr/userData/board/file/kezixitaboxen.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_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 11580 bytes
SHA-256: e06b310e193e5b8e554f9d5ab4293fb82d672dedef8ce21b2a017293c6c14c89
font_02_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 15380 bytes
SHA-256: 32f3b2f12d3098f0219350b4468b89398d46dc2dddaef1093250c1753ddfc006

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