Malicious PDF — malware analysis report

Static analysis result for SHA-256 124bb8ea105fd153…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1335a58b4d33b7f7968df263c33e3c4 SHA-1: 4b7a95791f4127fecd13775562aa49943ae7ac88 SHA-256: 124bb8ea105fd153404703e385796bd36d24eeb2c0df8dc57dd1ef4660560ff0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8835

Heuristics 4

  • 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.
  • 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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/70304859830.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd440ec93f---zenobaxupureku.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/deviwula.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/sowofikafagiro.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/64179530988.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/85696328049.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gijimexetazire.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/26172409149.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/naronuburepewo.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/jodokotivorovo.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/77765221880.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/42567907037.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/44183756039.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/1013858372.pdfIn PDF document text
    • http://chinalabware.ru/d/files/87041111323.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/xugoj.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gidekuwerofodoroturiluror.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bokomawiwosefigenoguxuja.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/34443248633.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/nawukuti.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/foduzuzepiw.pdfIn PDF document text
    • https://codecs.ro/images/file/wadiradexovokar.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/68770628042.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/62969858808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=open+source+android+appsPDF 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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 10488 bytes
SHA-256: f59c2323c2517f778bc941319678ea735b088b42736d1755dd7cdfb0deec3a94
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 17168 bytes
SHA-256: cd9d961bb0408bbddb22a674e63adae3a5b0143e999a1e3f92dfa9dce6c96734

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