Malicious PDF — malware analysis report

Static analysis result for SHA-256 c861f96d8df988b9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 20:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92c649c1557b7c4256ce76601dcd82a1 SHA-1: 78a50162ccf630a3d948134b3e42b14fe90b38ea SHA-256: c861f96d8df988b91de8c14938cca0bf63bc4e9f6be2723ffe64dcf2c5ddf6ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, though many are unknown or benign, suggest an attempt to redirect users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dxqzx.com/ckfinder/userfiles/files/20210913_230634.pdf In PDF document text
    • https://citytrafik.nu/images/file/jejiwavufelavejixeji.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/76910470981.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/jujutapar.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/39791166557.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/35282803680.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/fimusupupifaz.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/89805492004.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/lozurogudoniguteki.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506aa26b61---30796587118.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/10379408500.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/tetonidovasifu.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210917080603.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210909055403_ngcfua.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/99272730137.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/boxexevorelegivoso.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/punomawisuxi.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632343120.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/30104227031.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/16650301006.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/jozinewozujumusomobafogif.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_162423.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/vufutubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+root+android+using+magiskPDF 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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 10684 bytes
SHA-256: d672c23b6c0cfe49ceaa098573b1837b792f0fbf577eef14650524e0e017fb34
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 18992 bytes
SHA-256: 0baa135d6d65fe43e1c996e0b7ad5b2506a98e46c4086d5cf0f15fa455192f06
font_02_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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