Malicious PDF — malware analysis report

Static analysis result for SHA-256 490d1061034ad8cb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 07:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdcd25229851480abd0a7f7a103936c6 SHA-1: bc0ff6accbf1d5c8de8d8da2639641c7fa880a82 SHA-256: 490d1061034ad8cb1099103cc12a7908394e682eae36a5098da01833c150f0f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external PDF files hosted on various domains. While no scripts were explicitly extracted, the embedded nature of these links within a PDF structure often serves to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://electrogalicia.com/electrogalicia/recursos/archivos/91351828091.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135743d9db68---11548518969.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50383622662.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/vukojomodar.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/33982537670.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/wozusira.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/zotunobazuma.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jetupesepixidekerujitif.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/tisobisisitemuporabavufar.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/57684541922.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/66431395520.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/tikumidomulujunuwajumazof.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/253387254.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/limoravewudarovute.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xeboxux.pdfIn PDF document text
    • http://innotack.com/userfiles/file/84118443759.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/8756425808.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/89ead70ca684aa4acadedd1e2ac8b60e/80785446069.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/4094890585.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/67576518852.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/xopemekupe.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/vivofulowolelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wcc2+mod+android+1PDF 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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 10252 bytes
SHA-256: 4cf44fa201e38213f5d09e8da5e8ce8fbf625ea56a43c5352c5bd033d250ae1a
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 17188 bytes
SHA-256: d45ef775e5b4584e17d5cefc697bf1a25ead4b384af9471bf8223551d19b5a35
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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