Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a19834433f59c2…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 09:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cc3113fc557eefb79949210f667a4fd SHA-1: 3da45c5ff7978e133867c5bb1b7b0ae1bf7ef3b9 SHA-256: b6a19834433f59c28b5e74a523b68e89381738d91bf87190c02672286c3e82a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to obscure the ultimate destination or distribute multiple malicious files. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://adikketiga.com/contents/files/99431679039.pdf In PDF document text
    • https://projetovm.com/uploads/files/fileg.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/lesomija.pdfIn PDF document text
    • http://www.bash.cl/media/file/39995274625.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/mijujovapigowoxawe.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/patini.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/53758768644.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/22153689628.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/97952193276.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202110032209014290.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301fe4e025---15733626976.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54348384056.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/mibubuputamugemoxuxu.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/fumotavim.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b816a93e7b1d74e4120d110b46ca81da/tobujenexe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbc5106c6---jijufozam.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fopor.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/5173676342.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/tulitonokaxe.pdfIn PDF document text
    • http://gaudi.tw/upload/file/21580136978.pdfIn PDF document text
    • http://datcat.vn/2018/file/21370950401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+start+a+sentence+with+thePDF 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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 16100 bytes
SHA-256: a0e5e2e269da1558331fcf3bb2360ee130fa0b42bb41fcf4bfa5fcea518e09fe
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10612 bytes
SHA-256: 011a52496d3967dba853f0dec8ec6571db21218eb4665e655725c9c2274966f1
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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