Malicious PDF — malware analysis report

Static analysis result for SHA-256 04df71856e9255f0…

MALICIOUS

PDF

88.9 KB Created: 2021-10-12 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abbf1d0fe478d21cd60d07698150b18d SHA-1: 5d48fa39a2d1226dad15593af8d0e01060e5f0bf SHA-256: 04df71856e9255f0c2f5de73597e316edd21f13d16bfa1e2cb6cba7929bdcf05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://0851gay.org/userfiles/202109file/2021092505492570554.pdf In PDF document text
    • http://ensky-chemical.com/upload/files/jijojoto.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/dakesuzofulogenes.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/kisiwogatoved.pdfIn PDF document text
    • https://krusomying.com/data/file/tufevolarexenunenotabanux.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/kekitojevo.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/75068126562.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/lurilofuna.pdfIn PDF document text
    • http://beiks.info/public/file/60525038315.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53318539342.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/85633092412.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/vozenapunuto.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/63491247824.pdfIn PDF document text
    • http://olympusflights.com/files/files/nugibulisewakipegu.pdfIn PDF document text
    • http://geose.ru/userfiles/file/27973875070.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/73739495495.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/89519926846.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/loxotivetavuporuje.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/74801329355.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vomurokire.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/setokamesunikugobe.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/daxofanagiban.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/23606031584.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5531818097.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/88333222690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=photo+lab+picture+editor+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10860 bytes
SHA-256: 53f41f439041353ce7260358b0a3c65dafe98b9c8bb1fb7abc06ea449cf8c191
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16140 bytes
SHA-256: 61a689b2040f4a35dbc6fa766f7c43776a64fdb5ab975a49d30241655d41e80a
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 20680 bytes
SHA-256: b2b5c535697f26aa2cff02096c08b1b1be899971282b408fc5c388dbc7bd8dae
font_03_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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