Malicious PDF — malware analysis report

Static analysis result for SHA-256 8496ae7e8df65d5c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 09:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab642844afe824e547413e1771baa989 SHA-1: 6ed9224597d5b01e250eeac57a0c911cd8cdf403 SHA-256: 8496ae7e8df65d5c8ef570fbf286b7988706207b1654b4905d792d39cb9559fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous links to unknown PDFs hosted on disposable domains. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kfoodntea.com/dataroom/file/lizesuriw.pdf In PDF document text
    • https://cordovajewelry.com/images/file/53652377860.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/37022003565.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/67559914591.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d69026855---gupovabunik.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909145159_148584115.pdfIn PDF document text
    • http://minhanh.com/files/fipotojisekupikopowew.pdfIn PDF document text
    • http://e-district.org/userfiles/file/24905820489.pdfIn PDF document text
    • http://christopherdallo.com/file/sanowekusotufet.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94268de97---ritawomojomapovotal.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/42192685282.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/03051110514.pdfIn PDF document text
    • http://immopolignano.lu/images/35057876975.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/saviruwefavepijomefotog.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nusimirirawapokaxeni.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/35657211179.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/valoxotuxubeganilaxi.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/ditesezafarosoverol.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/53358033071.pdfIn PDF document text
    • http://santehnika34.ru/images/file/6895510926.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/24810879146.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/41659379514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=zelda+ocarina+of+time+gbaPDF 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_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 10752 bytes
SHA-256: fc4caa19d1d5d89a73dca87ae3a9228509a6443556b5cafbba3e34fb6bb40efd
font_02_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 17272 bytes
SHA-256: 34046b6d038ac7f69e465ed42feb03fb0232057f31e7213b8a7c95cccb85e361

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