Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ff0ae2aa84d420…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 22:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: edb3631c3bb57ab51f04376237120369 SHA-1: 0db33a01eaa0212ce012997404268c78bacffd09 SHA-256: 87ff0ae2aa84d4200c824167171ccb28e408aa288391d71e4b3177d05de0b226
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, suggesting it's designed to redirect users to numerous other PDF files hosted on various domains. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

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 http://www.fashiongale.ro/userfiles/files/46723090071.pdf In PDF document text
    • https://webaprint.be/img/file/mazagodosexusafewaxofun.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vedozofukuwivufizu.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/24366897965.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/94717228064.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/63d41e4e3b2be29f3f3109c2c7177a21/rugapi.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/vozogukotomewese.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fesuv.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/12823074165.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/76030154208.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9775fa20---gusazawibabipunenipikozo.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/mupazekepalitegebasezi.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/jajemutasobuvepufomiku.pdfIn PDF document text
    • https://rippa.pt/files/file/jexodisedazomoxisitawufa.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/maxiwimifuzu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93878975350.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/25806013205.pdfIn PDF document text
    • https://fong-cai.com/upload/files/jetonuxajufakogifa.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/lupujaturiwut.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/nodavojafanepurepaji.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dagederejalidiraxamugin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=keyword+research+software+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 14984 bytes
SHA-256: 1bc512824451ee73884e8a49d43f7f6121d8c5807e707ce5b80de1564507fdb2
font_02_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10672 bytes
SHA-256: 2a478f03ed26407601ff38e34c318fe610b3c99aa02508372f289616aceb0ddf

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