Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc9e390adfc9b40…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 06:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1a99443859436daa8a5d00a3a38a16f5 SHA-1: 771899b1dc3993b9477c2e45f129998a27cb055a SHA-256: cfc9e390adfc9b40b3644d3771baa8fab29c54b21eb89ab4618f5752b7d88012
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The file's structure and the presence of multiple external links strongly suggest it's part of a phishing or malware distribution campaign.

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://oniceh.ru/uplcv?utm_term=the+complete+combustion+of+ethanol PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135646a2cb98---15610979125.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/34928127635.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/leduf.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/55834661659.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/11137985996.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/paval.pdfIn PDF document text
    • http://mdteam.se/ckfinder/userfiles/files/rabuxedabazirilejolixofi.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/xobilezefubisuvetuwiju.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/91542469211.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/72821660265.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/piroxuvoxebagiwuwitunen.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wivaroge.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/fozugemuxonomagaso.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/34372560582.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/89eb80ca03f9d3b09fbef5787b78e673/difiriwetopowezi.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/99758036452.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8b749852---65234856349.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109082025099007.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/77705062467.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/130611285883.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/kowexutafezexoted.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/40001683305.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/47233494985.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 10848 bytes
SHA-256: 425d665369f137d8b5ef22122e8aad59721b214851cb85eee56a72fa0d3c4e35
font_01_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 18404 bytes
SHA-256: d254cf2ecf5db977b040050a8deddae1127b1ea05f81fabfc5cbc9717b68146b

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