Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08b9211e1abd8bb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 16:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28034eb5b5df2eb197559257665dd464 SHA-1: 3b7316e6d6c2107eb6087b2766400a411f094dfb SHA-256: e08b9211e1abd8bbc64dfe4c4d37ca881bfdbd16dfb0ecc0cc58c92abd8c82c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and ML classifiers. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or distribution point. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious intent behind a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ichibaninfotech.com/ckfinder/userfiles/files/4442364054.pdf In PDF document text
    • http://baiduvpn.com/upload/files/juligamopuruladawuv.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/36093110254.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/19470407289.pdfIn PDF document text
    • https://wmu24.ru/media/file/61752513269.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/gajupa.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/wirafupodilebiv.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/25399449350.pdfIn PDF document text
    • https://fasaac.org/temp/files/21406660748.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tivorivijerilema.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/deputavuzuwa.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/tirukevexabadapugubu.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/19188427620.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907210344.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/37961311534.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kitokinoratavovo.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109031725404563.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/87750109489.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/koloworuxebuxad.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146d1bc3ce---31266670993.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136677fe6bfc---58152461390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+spies+in+disguise+123moviesPDF 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16816 bytes
SHA-256: 266052e791e3adab6a6fc6ee40ef454362f0e9cd973cd0eeb5800750d42143be
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 11316 bytes
SHA-256: 6b8ff37a0db7b70fad601e6458ebc909f6fc711d9d572788d8b2c3df91fa9208

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