Malicious PDF — malware analysis report

Static analysis result for SHA-256 9711ad53f1ec5c76…

MALICIOUS

PDF

86.1 KB Created: 2021-10-08 04:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a231a79b68b1378d0bfd4505c7b0c699 SHA-1: abe3c4fe9fd5ccb7d7c14cf7f04e7ca537bf9bda SHA-256: 9711ad53f1ec5c76cead087bd0ff1898cfd5d93bcb62a7aea24b377605d52afa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file repositories. Heuristics indicate this PDF is a link farm on disposable hosting, designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=sample+paper+class+10+sst+with+solution PDF link annotation
    • http://studioarclab.eu/userfiles/files/wijakorabubeve.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/padawe.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/voxasima.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/58789512888.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161506bfc78731---sorapufomerokamefaf.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/74681007365.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/bukunoximulidetizexajajot.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/18495247790.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20211007_105455.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/51527832283.pdfIn PDF document text
    • http://baoveantam.org/upload/files/33919921464.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/933431094.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/85219385125.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/nowiwibidizax.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/tobuwizarowavitef.pdfIn PDF document text
    • http://mgrima.com/files/file/53614762577.pdfIn PDF document text
    • http://methese.com/upload/files/25026172147.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vijinirevojagotaj.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/luviretitiwibut.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/6165897194.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/97184311890.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/26326621253.pdfIn PDF document text
    • 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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 20472 bytes
SHA-256: c9fcc6a0a96c4415cdb15de828adbf5337f65d793debb61e786ea5fbcbe4c519
font_01_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 11076 bytes
SHA-256: e63d369423c9db23c9f9d3a4ddd314b44ed850b95809840aea01134022281066

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