Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5221f56b235bc45…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 20:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8619240ab105bcb20faf22c3df07ee0e SHA-1: d129b30c24572e50407377ba097c70715c55e0ae SHA-256: b5221f56b235bc45f5eb0bfc2add06b6a9d73f4093502bd305d4a50009a9d0c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs likely lead to phishing sites or further malware distribution, aligning with the typical behavior of a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates redirection.

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://queure.ru/uplcv?utm_term=ppsspp+harvest+moon+hero+of+leaf+valley PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ff652fadce3772c54cdd2b45c8e0b4e0/42426045191.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/filedidadojirovexobifera.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/44331573309.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/xegobuxeguwulawitopexuko.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/fudanajib.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/81383411249.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb349f1aa---risefipivedasorefo.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15682514731.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/96966564538.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/reviweketonijo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fixogudugajuj.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/66055455228.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/wujazav.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/xelopibaxuzerisufonid.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tikamosisezufuvupum.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/14113479324.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/57395201448.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gijudevufaxupesukefa.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/63897714977.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/31712543954.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121252362391.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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 10712 bytes
SHA-256: 0f690ce8d1cfe2eacc3455e87b94e4ed0bf629cd00962ac8f658d303d55ef4b3
font_01_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 17740 bytes
SHA-256: c6aef726bf719d431a2984176dd9d66d863c961fc5e896c4ccc75cd95490eccb

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