Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31b93dc23d44f13…

MALICIOUS

PDF

62.6 KB Created: 2021-09-17 01:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4732c85d8d608d6ca9ddf4e5b372918 SHA-1: 34c4fa74a2de5ce4f16b7ccfb387efbad5afc6ac SHA-256: b31b93dc23d44f13bce8f968771684ef20c4a3c87afb8aa1e91da8b283916a60
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to distinct hosts, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this redirection is for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7558

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 http://brukbet.com/user_images/file/76298947099.pdf In PDF document text
    • http://studiotravenzolo.it/userfiles/files/rowawemupado.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161370afb9748a---46917967502.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/danave.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/1298794293.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904122919417.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/79780749561.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/nivevalejusodin.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/60354708206.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/17298683367.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/todedujirub.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/finoger.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xixelawabapotopovaxelib.pdfIn PDF document text
    • https://felicityokolo.com/file/lujiwan.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/4664526905.pdfIn PDF document text
    • https://qkon.ca/images/file/90132351521.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tasugewimusipuk.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/zomumupeni.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/3506553530.pdfIn PDF document text
    • https://kaparatt.com/images/File/22783393030.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fesusonagupa.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/69199935900.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/buvukomizu.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/36875865526.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/36928632442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=col+record+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 10076 bytes
SHA-256: ca1f4b5d22789aae0b5aa92238dc579b67e40da847b2c5b4c51efc753d53e9cc

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