Malicious PDF — malware analysis report

Static analysis result for SHA-256 583e0facb912fe7d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 11:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59512ac33ca3beed8cd5b7f8a68622a6 SHA-1: 623f15a9e6a25674dbaa6e34f3852d77938df3ff SHA-256: 583e0facb912fe7dd25d6df9d4bc6599f85a2870269fc27628d4d9f82a777ff1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6519

Heuristics 4

  • 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.
  • 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://cructi.ru/uplcv?utm_term=bootloader+status+checker+apk PDF link annotation
    • http://theheavent.com/userfiles/files/87874464543.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/5843748953.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/80467390427.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/fuvomupavo.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/getapedoz.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/tawitafo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/26173980452.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/51232874271.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ladevijotofuwilaxu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613366d1b45e2---pamazaponelomujuxe.pdfIn PDF document text
    • https://istanajp2.com/contents/files/mirisusosugolawuwi.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/rokefatuwomatarinupi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tivujamilisufosolemuz.pdfIn PDF document text
    • http://gibisch.com/files/files/18488009339.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/xusuga.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/damoliruseboloxujok.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/53696891969.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614044f7197d5---30468419742.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/10918283373.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 19384 bytes
SHA-256: 44e788b383a0442bdfd81d8eeb28bbfb41143c2eb24bdb3ac2891a1c29354a86

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