Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be462f0b3d0625e…

MALICIOUS

PDF

85.3 KB Created: 2021-10-09 15:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 54d2319b4c9f4d79b4d58303be4e7a0d SHA-1: 5e7bdd62276f52ea77ebab137b5f6aaccb6abac3 SHA-256: 8be462f0b3d0625eac4bee62d91235de87afcf933f18aea687e0ca27f90592e1
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nuluzimifada.pdf In PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/wamiwufajukisoxatemavajib.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2654572586.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/23187459613.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/17430216348.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/mafesami.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/97971403467.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/webopagozusaxipe.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/tubijipajiziz.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/52275355793.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/vawabu.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/sawoxudidimuvomasokuxe.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/lisigigekavipi.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/76764949993.pdfIn PDF document text
    • https://architektor.ru/uploads/file/toxinoz.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/84523860632.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jajosilimuju.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/532285291614cdbcb55d08.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912081757.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/zunebesegakekexi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/31224326069.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/53344642204.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/ponod.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/gusepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tiny+red+bumps+on+facePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/28167356775.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 10956 bytes
SHA-256: 0034ebd57bdfc4e31129ea5c57f109ddad089573ab01cf85a953ce31e1c1169b
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 18564 bytes
SHA-256: 9e82b52a70c59b5a6dac2089680f641096e9c97e691a8c11f6a8dc46c3591f91