Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36ea4748a655d9c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 21:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 15b32c7307fd0e96826510d05c3ca795 SHA-1: ee4f380696de3533b743a8b435c3e277a0e6128b SHA-256: e36ea4748a655d9c6ff741b9c5c4f7316ee3f10a9b19ffcecbb8121600e5d760
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=android+best+backup+app PDF link annotation
    • http://electrogalicia.com/electrogalicia/recursos/archivos/65635154550.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/15123044254.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/34286157127.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210905180327.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/feloboweje.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xetotebipalon.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/lepox.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/87530878734.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/64654674000.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/gikozukimoj.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/guxav.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/pituzujuzivige.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/59833217248.pdfIn PDF document text
    • http://videlec.be/ressource/file/70638988516.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee74ee55ce---81243339995.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mivazadazinafumu.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/vapewonatemigiverujuzal.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/nalatijiwetilagat.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p7laulumhtjmv64ipvs0v22u90/rinoxunakores.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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10772 bytes
SHA-256: 6aeebdb98a11103d35eef15979a138d12fb17a481c1e560fa137bdd427378ae6
font_02_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 17084 bytes
SHA-256: f455328845bfe9828cda2daa5a20ed450d5b06c8b9a6f9b4b518dd9ebd6b7e0d

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