Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5328eb54923cf63…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 19:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71e6df5e488b899edaae98541d924a79 SHA-1: a0cd4f5a7b48fd8cdd842f5de0c406ac2ff2f9ef SHA-256: c5328eb54923cf630367001b0942582b2e23f79f3cd78eedc4699b5d1157cda8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external sites, and the ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these URLs are part of a link farm designed to obscure the true destination, likely a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself is indicative of exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://viquadro.com/userfiles/files/zuwugemojekufogunolabijiw.pdf In PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kafukulokejamawe.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/bujeribepufix.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/ratabepane.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/zobozazubo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/62386431389.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/zovofukav.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/zirosobovoxirudibedivu.pdfIn PDF document text
    • https://shevian.com/images/file/61435100201.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210909214518.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cff46de6d---10219745993.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/nunilewibejitodage.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210915174825.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/puvazalokisetumisopa.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/68715026006.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tojujuw.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/53644216249.pdfIn PDF document text
    • http://taxfreepoint.com/file/guxiga.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/46102134263.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/womevukud.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/91453570285.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/74057392721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=workout+tracker+app+androidPDF 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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 17004 bytes
SHA-256: 784b7cf7378299e404ac24246a202333d4579e660ed1766b82d8a93b6156ddd7
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 10476 bytes
SHA-256: d01087887a58e3d3af92049fd84e2c55bad643546aef722c9f852ed9cc33d23d

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