Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdbdc8cea62741b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 14:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2544295128abb7e9f543fd997955f01a SHA-1: 18c53eebf8b6063aa92c68dd722fa2ed5702572e SHA-256: 0cdbdc8cea62741b78039f2669efd58e780fcc60e75c7e275bbe3af830686cf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The presence of embedded URLs and the structure suggest an attempt to lure users to potentially malicious sites. While no scripts were explicitly extracted, the PDF's nature and the heuristic firings indicate it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://fusen-es.info/yamituki-n/uploads/files/sopuvilifawojo.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/30372626632.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/zupuraj.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/bejaje.pdfIn PDF document text
    • https://kenadong.com/contents/files/24339557126.pdfIn PDF document text
    • https://paperland.bg/uploads/file/pitotigemuge.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/82727341494.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/gevon.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/niwatatarad.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/39036719817.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/vulokafafalamuruvujes.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ohe3cvj7r0hshacnbhuf7smqn2/16563043898.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ot1khtonbccskmp1q3kpq7irv5/jumofoxejakapum.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/vaxaronuzeti.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/bumewoginujafadilowe.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/37688954165.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/wuwotiligadam.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jovazob.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/85020858661.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210903163067564742.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/vizagafepurajojariz.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/vidotojedumavevekibisos.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/32022116941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=strong+words+that+start+with+rPDF 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_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 16800 bytes
SHA-256: aec479ce7d63f259e78bcbaf66e006b9af693ed8d7f4237a8a161befdbb9a890
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10512 bytes
SHA-256: bb80075f6db58f6a7d64726d3bfc4829a26c74e91a393c646073a29640aebb31
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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