Malicious PDF — malware analysis report

Static analysis result for SHA-256 216207a0828110ed…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 10:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 413fc1aa0015dbf88d4668bba89acc86 SHA-1: 03ad12cb4c2b9d03bc1ae5bcde930eda5a41a2a3 SHA-256: 216207a0828110ed3b6e60a521e9fb81b9d26d638445e75c45732d44690d2bda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://12shio4.com/contents/files/41814110045.pdf In PDF document text
    • http://373113.linker.tw/files/kudux.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/17113851996.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/lavakelokidakimokiw.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xasakojabitipu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/24996705149.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/luzixilorufizofufuru.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pilugomogoje.pdfIn PDF document text
    • https://kueapem.com/contents/files/63805218618.pdfIn PDF document text
    • https://combrooncom.com/contents/files/rewoki.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/tabupodenagididi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/nagovogotisifenixagase.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63519915438.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xadokobuvojogiwuranapod.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/vedev.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/65038885425.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613925f0ec48e---64179075393.pdfIn PDF document text
    • https://tcremich.lu/files/files/fipopowegat.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/gilafibesovivada.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/vuvusaxevexuxibata.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/93955057013.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nutibekafi.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/16916765783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=microsoft+lumia+535+android+installPDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 19792 bytes
SHA-256: 52bb16224c318751d3e3d9bc998375010b68a56de269280ee806704accfa565a
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 10904 bytes
SHA-256: 8c87642466b664a830926110cac4b62c75a45fe8e36cadc73ee92f2353678165