Malicious PDF — malware analysis report

Static analysis result for SHA-256 15daef59c6601feb…

MALICIOUS

PDF

78.1 KB Created: 2021-10-12 22:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a562b86ebd047ca902f166ed75124399 SHA-1: ba6578c49f02dc8f35415590ca0c2ac895b43c80 SHA-256: 15daef59c6601feb04b0e0a492ef531661392a0331c5910f6f26f858e210763d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

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://coretry.ru/uplcv?utm_term=computer+fundamentals+questions+and+answers+multiple+choice PDF link annotation
    • https://emenu.hu/editor_up/60107570173.pdfIn PDF document text
    • https://sinarwaja.com/account/files/98616091606.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/zisejepelejurel.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/xatipexosonifowuxanonil.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/91296322562.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/kuninobapinunexov.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/40574850323.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/92269495168.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_3405F2E56424150E.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tizakizokebotixabasegi.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/89008361448.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/jitede.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/97089807.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/18658505876.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mugoke.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/33068210279.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/limeniwafinaxegakuro.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/kaloxuzesibumagonizofe.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/45027196464.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109102057248510.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/widudalumow.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/71958823016.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/regibukivunurepobomijex.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/laxiruga.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 20684 bytes
SHA-256: 6f5f9596c6f695c711c9b5a2ec2645abfb801e071d9eb39ba8321647a1be12df
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 11248 bytes
SHA-256: 0a48abe7a41b86773ba2a2c7f0df023977fdc1fc8ed3912d8fc0e252a8ea6e28

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