Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c86d81df59f412…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 09:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39726f3f496b3fd7c003b1aa286b5e02 SHA-1: 36e9ed878419f2dbc6d4a39554e487d83b17f46d SHA-256: 02c86d81df59f412e5f6dd3ad74a9594dd150c9fef80d89168580aef6fd21f0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=twilight+breaking+dawn+part+2+putlocker PDF link annotation
    • https://elemonbg.com/Files/File/bateboban.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zilujodam.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/fobemurolin.pdfIn PDF document text
    • https://sapporopools.com/contents/files/mebogaberiretumemudoza.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/lonadotozajixarajediwa.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gezokukepima.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/97373704276.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/voxus.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0bdd9e39940f48cc09888a619b624c88/danowa.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210908/16310761375724.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wotipujusa.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/88678727200.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109160103341499.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/tugobajaxakisesiloga.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/5655095704.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/riposisasom.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/laguraxarugugejixapugut.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/89190585869.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xapuronowu.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/22212610198.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/tuxajetifezaminefonenoto.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/27673747180.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/98010152857.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/82390782419.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_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 11124 bytes
SHA-256: 601bd4e93eba19337efef6022a7bf32a0daabbd48b2824bad79c054eb8e8e6eb
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17284 bytes
SHA-256: 1eb4c35c03c86f98d70c90e76046c52e2cd081769f621d75b00e22fb1dfaadfe

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