Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1cec5da58d38d…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 12:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8080857c0addebaabee0f72523cd0c6b SHA-1: bfd2cd6de51232459b6e42914bf2f91e83675231 SHA-256: 19a1cec5da58d38d3173e1efd38e2d72a297a01d5457488ddee587e8a6259b24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to disposable hosting, suggesting an attempt to obscure the final destination or distribute phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zifu-tech.com/app/webroot/userfiles/files/99140965641.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/87619918901.pdf
    • http://flirdining.com/uploads/files/vejenekopowumefataripu.pdf
    • https://sesconbs.org.br/ckfinder/userfiles/files/sojowakaturumogotep.pdf
    • http://starinviter.com/ckimagefiles/88167908139.pdf
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919060058877975.pdf
    • https://ijtm.in/userfiles/file/72047942407.pdf
    • http://baovevietnam-vnss.com/upload/file/wuruw.pdf
    • https://thefertilizerproductionline.com/d/files/sojunikuradiviz.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/sijixiwetanotebonizumid.pdf
    • http://beiks.info/public/file/98269902237.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/39152284879.pdf
    • https://youxsoft.com/uploads/files/10273267906.pdf
    • https://tvsporedi.si/vsebina/jejeku.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/7575094f004685b8077f8d72e2694240.pdf
    • http://bjyhyy.cn/filespath/files/20210909115557.pdf
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/jabedakebanabu.pdf
    • http://consade.com/userfiles/file/bolewarapupevafujuvubali.pdf
    • https://calmoinc.com/upload/editor/file/baninukiru.pdf
    • http://huseyindurmuslar.com/images_upload/files/xetapixe.pdf
    • http://apart1day.ru/file/63749815471.pdf
    • http://bcslaw.hu/admin/fck_upload/file/gisupiboginuridobo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=temple+run+game+download+temple+run+game
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin
2f37bf029e30fa478c96d361e7e6db316c3f190f8a30a5c6ef07a7a3a6df79d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 18940 bytes
font_01_sfnt_off00011d73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
font_02_sfnt_off0001358a.bin
9cf1642f6c2d57858f3d768bbd095d2f16dae20a54b1e99b2544e083cd87eb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 10624 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.