Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b076275a129221…

MALICIOUS

PDF

82.0 KB Created: 2021-10-11 21:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35f490af15b8ed889d62fb14aaa375c9 SHA-1: 104b48bc60f9751a715a89dd63a8e0e0dd36dcae SHA-256: f8b076275a129221a15341dec29db65fd508cbba797c126cd1537004b2997ca0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7655

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615152b5a8e88---petisejagofibidalolube.pdf In PDF document text
    • https://abouelhoulgroup.com/userfiles/files/83532895588.pdfIn PDF document text
    • http://air-ned.com/uploads/files/9259954339.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150991a90f58---vubinedetugufide.pdfIn PDF document text
    • https://ubranni.com/uploader/files/6132091015.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/megezobavevutebifokedalit.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/gupixisaripotebasevajin.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/popumajukopabujodex.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/sakovazibilun.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/bofevof.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/wuserubobopojugagirasatut.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/jafoketotixivonanoku.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/wopojudufokox.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/25479990899.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulamogifeserab.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-5/20210905203131709253.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/nepitatuzaverakinozuvub.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/vofasimaxelujigo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/kefixevapadegopexi.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/4369821753.pdfIn PDF document text
    • http://nscenter.cn/upload/files/subagu.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/99211646593.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pepejemas.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/3123947713.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=months+in+malayPDF link annotation
    • 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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 19488 bytes
SHA-256: c58b11a356b95beb09a5c5e24a36532457c45cba86d76d5f63d995af7483a57a
font_01_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 10248 bytes
SHA-256: 1d4b959616a3b4e845090b18d7644ee032d2b75a711171294fa58c2bb4d54a52
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1