Malicious PDF — malware analysis report

Static analysis result for SHA-256 953f526658b0fb36…

MALICIOUS

PDF

75.7 KB Created: 2021-10-10 09:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b8d5ba9ce5348b616e0660e762ff3ad SHA-1: 2af312fe988ef28a1256cf821ee633138b2a6753 SHA-256: 953f526658b0fb363bb6eae3ee48a5fe340661e3d628651134c6195c4d43db54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these linked documents.

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://cmf8.ir/data/file/97015170428.pdf In PDF document text
    • http://vervesimuhub.com/userfiles/file/62572923805.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/rapamesixewejiwup.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/supenotinupi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/nimowegateditosiwujegi.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/12023097838.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/90251229632.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161452dda81a55---23429703700.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/zavipimobig.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909205033.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/40619827208.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/rasozafetiv.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/nidakeputajerikokowadusol.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20211008053124.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/97941211178.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/zovovodame.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/20188764065.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/repitazixux.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210907131801.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/bigiker.pdfIn PDF document text
    • http://mutitar.com/user_img/files/31289588845.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/97102835377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pay+my+federal+taxesPDF 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_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 17304 bytes
SHA-256: 3d0d2c49e0c387d32f82d1156db8f3af37128078db8a4ca9fdb96e9aab27945c
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 10416 bytes
SHA-256: c58ff161f7ff423436a3f83a4692939dbca83ed3b615f5b078d7daf4f90ddfa5

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