Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d93f99c3f63570…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 00:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49f8e616887bb9b61472b6787f367e91 SHA-1: bc68fb1a2915feac83ee215c62e2c711d61b5aa0 SHA-256: c5d93f99c3f63570d63a19b2e43d2ede99761e2b06f17d8e98b39d0ee8687751
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm on disposable hosting. The embedded URLs, such as http://swaptoys.org/ckeditor/uploads/files/suxikorajoku.pdf, likely serve as lures to download further malicious content. No scripts were extracted, but the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://swaptoys.org/ckeditor/uploads/files/suxikorajoku.pdf In PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/96238572697.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109050327458274.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/13750587687.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/11387543373.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/87653296248.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/wisosofimokujutamesikan.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/mumaxidijoz.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613807e29c080---wokapurowovonovazunux.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/befewebumorivut.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/fujokolewenorar.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/24640827283.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090621482073499.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/lafozusegaxoxaparom.pdfIn PDF document text
    • http://skolky.info/foto/images/file/53570794926.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/22572400981.pdfIn PDF document text
    • http://kleiberit.ru/files/file/disuwomumezemisosuno.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/3956337328.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/2028025758.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/1574625386.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/70637383141.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/vugijidinigulivujarav.pdfIn PDF document text
    • http://usateatop.com/_upload/files/36372304202.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b59517d4a---12000987294.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/37783284228.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/89151720824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=connect+android+screen+to+macPDF 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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10516 bytes
SHA-256: 4484eb80a94bea305a92b3bf635d3d8cb5eeb1881d7fb7309127afb63cb1b781
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 17584 bytes
SHA-256: d490c81402e087cd0e16b83541b2464090070d8d71d1cb1bb24926c776866c9b