Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3044c92359842…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 22:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5283ab81d8cf411ba2ee78a92e9cf63e SHA-1: 6ab561bb36322c6bfb1dbe239e83c3d564c32a37 SHA-256: 9ff3044c92359842865a1ec8d80cfed662478dd246adc59f0d36626de1817fff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to potentially harmful websites, aligning with Spearphishing Attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://philabc.ru/uplcv?utm_term=best+way+to+convert+pdf+to+epub PDF link annotation
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/36150917240.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/86582041124.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/nepimob.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/69579188440.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/dogenaxumetemu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///30331651144.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141642e91176---5206538568.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/20850539663.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903224815.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/58563706375.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613831d31dd3b---posus.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/40434892995.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/wegixulilumekosutezodidu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rorekumeruvun.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/lutegegaxujejadum.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/sugulerik.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/gaxobuvulegefipexozoxa.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/fibizijaxonititexexu.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/46592555613.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091302231873499.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fodozuvivoz.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/36081905211.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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 11032 bytes
SHA-256: a07013c64a80ceccf8493b25adc610ba67951203f7d73d96daec4fa57d347489
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 17412 bytes
SHA-256: ae14e2fa184007d40f4eb6def2a39c8a0cecbfe79c20a92252feb190c41e64d5
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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