Malicious PDF — malware analysis report

Static analysis result for SHA-256 b678b0a6eff822ef…

MALICIOUS

PDF

63.7 KB Created: 2021-09-25 22:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d15864f23b6143ca089874368c47c598 SHA-1: c66fdee30d7388f275bd73aad4ef2e5586a007b7 SHA-256: b678b0a6eff822eff6f4a7a115f3f7e82a4eedda793c8a33741fe8dccfbfaf5a
124 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a malicious intent to obscure the true destination or distribute malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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://pataniforum.com/admin/jquery/ckfinder/userfiles/files/36372991456.pdf In PDF document text
    • https://rachelrom.com/rescontent/file/napisasilukotuda.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/6069461473.pdfIn PDF document text
    • http://lucca.jpsoftware.sk/upload/files/mafajugulidu.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/82442264118.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/59833518132.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/gejibezizideviwofetorixe.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/kubebemubemibevame.pdfIn PDF document text
    • http://ergakiland.ru/files/files/lodetafewetu.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/43656910695.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///joboregazeje.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/madefuzetuxigu.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/63593768735.pdfIn PDF document text
    • http://scarpatti.com/files/mamorarepolovutezuzudoso.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/12813837595.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414160719cf---77540976153.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/beguvipaliraxakuzomuwisop.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/46018941272.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/fegezulanopeli.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2a8908aae6fc6c3477d3e1d0b1aced37/rozorowisivoxadojapetaxok.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/milufoxotevimateviwiko.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/625385315.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/2660260819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+video+maker+app+for+pc+freePDF link annotation
    • 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_off0000aec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 15548 bytes
SHA-256: a2aaf17def60250c4d0d9e68dd25f6f18089fea53e14671704c266f68bdc7608