Malicious PDF — malware analysis report

Static analysis result for SHA-256 434bc566f1293373…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5f3cf210203ca84b0042bb5e2ae03d5 SHA-1: fd0ec78f7b38650df901f999a91644a020e883a4 SHA-256: 434bc566f129337325b8fb8de4a96ad772950396d261447701e2d8115527c0c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to potentially disposable hosting, a common technique for phishing or malware distribution. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://parisnordmedical.fr/docs/file/268326826.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kuzibanofokarozorozoxowig.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/87526983377.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/nanives.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902111345644.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/nokafawaxiwenatanis.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/37929433469.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/35451828228.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/12850919691.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/63259577312.pdfIn PDF document text
    • http://shopabrang.com/images/files/jedolafobex.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/derenimuxenuwotetivewi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa642c3f7e---96147249454.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/55475228341.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/debawedewepijipadipogego.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/49886588843.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/tojorewasuwolavi.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/81091784756.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/gugewonuwa.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090413153716.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/58376680917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=height+increase+workout+mod+apkPDF 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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 11184 bytes
SHA-256: 96e3d1d993eb39464002e2cafc8263a3e75e350941949c058b7102eb48eb5b5c
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 18424 bytes
SHA-256: d9cf733690f1b8bab01f78f40c7ecb21f131143d208f7dcfcc689fdc4eaad8a4

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