Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4078e27d7dec75…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 21:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65f11ebf4c3914d10f4cb766322575c3 SHA-1: 51379265c02a21cbc2d975e68d22750e473254c9 SHA-256: ce4078e27d7dec75e678e4d46976cbe6e3f53c9a7129d90d5c7286e89d9ccbc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including one with a 'utm_term' parameter suggesting tracking, point towards a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, commonly used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=name+the+8+planets+in+order+from+the+sun PDF link annotation
    • http://galettedesrois.eu/userfiles/file/57873221211.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/6429756661.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/duguf.pdfIn PDF document text
    • https://aashianarealty.com/file/68867275487.pdfIn PDF document text
    • http://jcpingie.be/public/files/wulodeberibogogojekariso.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/24408607653.pdfIn PDF document text
    • http://skia22.ru/pic/file/61697298315.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/jivekewusokuxa.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/viriwujedivabinavo.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/09/40278920649.pdfIn PDF document text
    • http://haphadoor.com/upload/files/54882775136.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909015702382620.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/99785961163.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/xenafopanujekop.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/91736047974.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/31482888136.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/80859975210.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/74275816475.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pinibosilukimomig.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/51217801550.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/mowevepezunorevaj.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6c0efd69---24830103005.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904080044_1436434961.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/15215194601.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/xevazefil.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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 11048 bytes
SHA-256: f6b257e8e3b30263f235898c55fc03e456fa77d2caab818763719554ed5d6900
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 18772 bytes
SHA-256: 45472b20866fdd1d24e8908224cd2ed834e84166db86fa38c33b638eb9377f6a

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