Malicious PDF — malware analysis report

Static analysis result for SHA-256 17147bcf8230115b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-14 12:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b256163e0bebe780ce500e0c93709862 SHA-1: 02542d12829cea44d294247a0a8a8f601b1e4c33 SHA-256: 17147bcf8230115bddd470627916ed3dc67b92381c0c60662ff15e66b3e7223f
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jordan.si/dokumenti/file/11489492845.pdf In PDF document text
    • http://holidayservicemarsala.it/userfiles/files/bodiwilizote.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909171537668.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/85253749539.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/zomutafojapufiwowi.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/resifurukoduno.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/donupusesobetekufufu.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907033523.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/wupakigavedopugana.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/23104692853.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631075039.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/lepemekuturukorikadalu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/96302758236.pdfIn PDF document text
    • http://runbo.net/upfiles/files/1631103676359.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e5bda7d4---36937210819.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/62627895217.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/85806045103.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/gegujobuxasufewe.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/wodifexuwaluride.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210903093432657439kunrv.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/winolalazowusujis.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vawajuj.pdfIn PDF document text
    • http://chemicalengineers.ie/images/jozuludabo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/33176797654.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/duwefidedifafofube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=partial+derivative+calculator+at+a+pointPDF 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_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 15288 bytes
SHA-256: 2423a13c74c5f47141b35fc1be55b1db98dae588087395b31bc6b8649d0b8df0
font_01_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 10508 bytes
SHA-256: a09362ccac4647353d433b61cdfe620606a89c4de318a2d41ba993de2436e71f
font_02_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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