Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf62ad7cea226702…

MALICIOUS

PDF

90.7 KB Created: 2021-09-20 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68099175d08c8e90df7e219c891e236f SHA-1: ed69062e1984f3b35bafd2ed82e21590b8c3f0ed SHA-256: cf62ad7cea226702ca4edffae47554fd9472abdaa3b14ce60a22f7266506edea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating 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 malicious websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=the+paranoid+android
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451309db046---koparafe.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/65861839937.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/xalitatikemexevuto.pdf
    • http://printrun.nl/userfiles/files/56114376058.pdf
    • https://tainandentist.com/uploads/files/202109041150563404.pdf
    • http://pyhunlian.com/uploadfile/file/filowulebifavop.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/86265231664.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/35367123261.pdf
    • http://apmnir.ro/fckfiles/file/46095925021.pdf
    • http://nandishoverseas.com/UserFiles/File/tuvadezemisaruv.pdf
    • http://gemwishrs.com/ckfinder/stones/files/winusugata.pdf
    • http://ecovn.vn/uploads/news_file/5051518065.pdf
    • http://ammk.sk/userfiles/file/nexiboxuzolusawi.pdf
    • https://ever-progress.com/upload/files/melemujika.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/74723945227.pdf
    • http://travellightnepal.com/userfiles/file/29656086097.pdf
    • http://shinaval.ru/userfiles/file/51826491735.pdf
    • http://mq-water.net/upload/2804043559.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091704370573499.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/jifoja.pdf
    • https://marikakozmetika.hu/editor_up/fozepuzulamuxagopudike.pdf
    • http://mijinmotor.com/fckeditor/userfiles/file/tezonoxijonapolatifero.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/50352109332.pdf
    • http://ladyqueen.it/userfiles/files/baroverogi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe24.bin
94a25017cd6d0a17e421302579eeaae72d63feb720bc28cece633526a30b2a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 18588 bytes
font_01_sfnt_off00012e7d.bin
47830912cbae25aaabdf5f58f4612fbd7ce2ba6e1edb2a6dc1873958cb94f6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 10140 bytes
font_02_sfnt_off00014502.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14502 16792 bytes

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