Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e201339e2422bb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 11:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9662b65dfd6621e88f295120685af2d SHA-1: f7f67c353c1a038c64b0441b0713ad02c78dc859 SHA-256: b4e201339e2422bb1be2cdc010acbb0ac6a0bd8953fb43f6cf4a4931c9bbc2c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=sending+an+email+with+a+resume PDF link annotation
    • http://cachnhietwin.com/luutru/files/wixetulib.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/seteposapab.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/nogadavofogeziwefo.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/36074800453.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/muxekisu.pdfIn PDF document text
    • https://manenshop.com/upload/files/95511754172.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/97748938495.pdfIn PDF document text
    • https://lecachet.fr/docs/files/safux.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/32960989307.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/wizukisufawuzopanumuw.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/27051907000.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/sewelefujixeguzupojotunot.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/giradijusodajifuvidadate.pdfIn PDF document text
    • http://geoman.cz/data/file/ladowog.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb260e5404---16527252096.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/42688796854.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25177769705.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030624381930.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/85112211931.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65091123692.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/62290514938.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/154641ea852ea52fcdd64484854e7cd6/totunadituledofe.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/lavilatajesoneruturom.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/32066543870.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 18564 bytes
SHA-256: 7218f106478c5347f65b97ee7251f2d621c0e388cc13a2c732db86486cf4c87b
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 10836 bytes
SHA-256: 8c181c0be40c8c3c0479d491a8e8fb841d92f6bf8990a7aa96ced1ce61f66c65

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