Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd8cc519fdfcd9…

MALICIOUS

PDF

56.7 KB Created: 2021-09-25 17:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63b139aac61c788e7bc2ef791402de3a SHA-1: c81ee959bbfc03123a7d50353b790b3e0ea4a076 SHA-256: b3bd8cc519fdfcd9c22ec3573502cf9d37943eac8f73b3c19e91743a7f933f52
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous external links hosted on disposable domains. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 56 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=how+to+mirror+your+phone+to+tv+with+chromecast PDF link annotation
    • https://trompis-tondschungel.de/userfiles/file/29987374501.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d874342299cade76fd14aa6d01ac1d9/99918835229.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/puxenitinuvawaraxutusat.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/57355517587.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/94518910639.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/sifabaxulilul.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/62235063609.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/45976124034.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/37979547403.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/fixuxurirazijixe.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/36929256061.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/79339435050.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/vaxekutiniges.pdfIn PDF document text
    • https://dalba.net/other_files/File/6361442682.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/45658635722.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/92698431815.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/9448012969.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/39016452481.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/nolave.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/50610317090.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210914170954_s3y5m5.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/90777549475.pdfIn PDF document text
    • 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_off0000aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 10948 bytes
SHA-256: e7cf55ec66a4009ac669d7cbb432752c97cb07a8485120b3706f1c2ee3a30109

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