Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3a2f454f18357e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 20:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 714c006438423342981827033c1be844 SHA-1: ba7a62b6f518d0755df7dee9841e87b8477bea60 SHA-256: 1a3a2f454f18357e25823b47d666d856e2f65299e296a866ffc3df06708c397b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing infrastructure designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://fa-vietnam.com/webroot/img/files/69880070625.pdf In PDF document text
    • https://dunaweb.co/bg_image/files/raruzetamoworonetaziz.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/wurivukabu.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/80110686717.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/45932444965.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/kuxosaned.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/tevusobuxulozuzifubufuki.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/59239528468.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/83205067189.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/dafaferomatedata.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/43200353813.pdfIn PDF document text
    • https://ms02bet.com/contents/files/12650344584.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zameda.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/fesuko.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a5b3f13---mugima.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/dupiwijotob.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/47185133055.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/16557627721.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/3479844608.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/60331771020.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/54645797246.pdfIn PDF document text
    • https://upaspor.com/resimler/files/40643765661.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bewozobotafetedenifufo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/ridelemezulivusotaw.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2d2f8624178edae092736b5e5b17f0d8/momagozerorofujuvikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nintendo+eshop+apkPDF link annotation
    • 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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 10412 bytes
SHA-256: 23d79e8570adf5a7dacb9b4a002bf20df6a56db4c6f7542ba15efa2a744b7ce0
font_01_sfnt_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 17724 bytes
SHA-256: be4cf75d643f28143606d6a62da1e3b01ecc13371fdf1eb3910c3be2adbd7bc7