Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f2c86cd821eb62…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 17:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2ae230f50befa60d5d99a64857284b0 SHA-1: de66ce99f56fc8c7b9998981f9b3fc755836380d SHA-256: a1f2c86cd821eb622292bfad3b500132a476ca232d856733a0389ab744d96c7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript, suggesting it may attempt to execute malicious code or redirect the user. The PDF also functions as a link farm, hosting a large number of URLs across many distinct hosts, many of which are disposable, reinforcing the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wadenarotabewubi.pdf
    • http://miyisz.com/mingyi/images/userfiles/file/10605990022.pdf
    • http://rubivina.com/Images_upload/files/duxozureloro.pdf
    • http://palmdale.thepokeluau.com/uploads/files/dozojawunidon.pdf
    • http://zit-tech.com/userfiles/files/2350119544.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c9bfa9b4084e9e96826cf1a828ea86c3/69491811665.pdf
    • http://belstroyiz.ru/img/file/vojuzizijezejuvilenike.pdf
    • http://www.florentmaussion.net/userfiles/File/foris.pdf
    • http://stonepigments.com/userfiles/file/48235127432.pdf
    • https://rwd.webseo.tw/upload/files/90024757663.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/89929742905.pdf
    • http://aytekinpolatel.com/image/files/lujabituga.pdf
    • http://color-gateway.com/userfiles/file/rosesunojubegekasames.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/19339383264.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da81e5961---64378774209.pdf
    • http://ty6600.com/userfiles/file/fitudebupifekituvuwi.pdf
    • http://thietbiotoviet.com/Images_upload/files/91104294899.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/21879826076.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/47952500571.pdf
    • http://labonscafe.com/userfiles/vipowukuboletiduzopob.pdf
    • https://vmwarts.com/ecovic/file/solen.pdf
    • http://home-plast.ru/foto/files/88676495642.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=custom+listview+with+arrayadapter+in+android
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/lixajemakikuzabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
font_01_sfnt_off00010637.bin
225db30fec6b5c11f38d6864cf29341ee947edb817b2aee956d5db7803eef20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 11056 bytes
font_02_sfnt_off00011fd9.bin
fff65139dff3dfadc1351a774ab01aafb7220569d94a414edc6ce7d6d97d6a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 18048 bytes

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