Malicious PDF — malware analysis report

Static analysis result for SHA-256 139fbb23fb4964a0…

MALICIOUS

PDF

97.7 KB Created: 2021-09-10 10:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91b7e9ea8d9d871fe3fe2a17a75043f2 SHA-1: 1aa9c6ec7cbd22d3b44f491e49bded4c979563e0 SHA-256: 139fbb23fb4964a0793dc5e0926bf3d841d0dea96337b4e3ce8efcffef40c1b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6683d521ee48bc3f11ae56cc1d1dc3f5/sevimifo.pdf In PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/89938854435.pdfIn PDF document text
    • http://drironcat.com/images/file/93173015889.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/59803278324.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/32729859927.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lerimejubiba.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/wodovifutulixuxobu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/31077419783.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/29128397753.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jewagizovisavinibejemuxad.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wonusaziwil.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/fejelamunimipekepone.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/93775752035.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sexijo.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/tififugi.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-8/20210908034830277118.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/40317769296.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/48321296290.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/lilobezitiwute.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/80368568694.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356f7139b01---gupelamed.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xajaduti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=amepdl+net+auPDF 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_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 10156 bytes
SHA-256: 8d15d0803d0e1c8aafde8a6418bcca4dbf86b15baa37e6ef78da48921502860f
font_01_sfnt_off0001335c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6E 17892 bytes
SHA-256: 23f1873495c80d8ccc6b9129ba09efd9cec45b9a4533f055b65c84a4d5f2fe85

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