Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fc457bb91a9753…

MALICIOUS

PDF

65.1 KB Created: 2021-09-26 20:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f3356dbdfdac63eb0c3867b114f5b2db SHA-1: 76edc967151249ddef019c2fe2c4a7952dae1ae8 SHA-256: 79fc457bb91a975345f33ecdde519d6956b08a8bfd17a6dc0791c68aefa3b972
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming campaign aimed at tricking users into visiting compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4432

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=active+voice+vs+passive+voice+checker PDF link annotation
    • https://drinkpoint.com/uploads/files/97137398704.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/31711633080.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/13975621671.pdfIn PDF document text
    • http://specimport.by/files/files/gupidegabokul.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501752d3426---43108711162.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/52705305198.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijumirujivod.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/pudimabubozokutog.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/26163157462.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/38592539020.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/35026695760.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210922172150.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/44178387240.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/mibasodorisupogowazanosen.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/31946581925.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/tejexerixosidef.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/tulujepamikumiluxuregul.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/68907033198.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xomamidafipo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434b95683fc---96651909654.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/27852189605.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kisawopewogofidi.pdfIn PDF document text
    • http://4darchitecture.org/img/all/24572052502.pdfIn 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_off0000afd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD6 15384 bytes
SHA-256: eebe7b0606c3909aae83f9c19eb331660098b63212284825d322cbbe8823afab
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10460 bytes
SHA-256: f47c01c40cd20b6bc124126aa7e0935d6387fe8b384001375ab71280b1a3e92e

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