Malicious PDF — malware analysis report

Static analysis result for SHA-256 939ba8f65f4dc1ac…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 00:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d75e2e39ed3add7e1af4da6ac6fdcdf9 SHA-1: 0f03a8dd9d4ca4668c8d25ad4730516321ab3b7c SHA-256: 939ba8f65f4dc1ac47b2067179db382540f4b446300af3d85172b3f9371c7841
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, including a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://prestinieurope.com/userfiles/files/pujenaliwaxov.pdf In PDF document text
    • https://tennis-samara.ru/img/file/piferimagubilonajeve.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/2588347641.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/foludago.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88ba7820b---sewaneraxarelenim.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/degixulevapes.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909170637775964.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/35594510932.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/47929548994.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/37357394909.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/meduvasurebitowepesavup.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109061655131466.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zofosupivewibagimota.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/20670592893.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/15153351860.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/38547293002.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/33259130586.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/nibomefolazisuxojejo.pdfIn PDF document text
    • http://anpharma.net/upload/files/kawonokujesizibiw.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/9534620960.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/rajosewave.pdfIn PDF document text
    • http://wohingltd.com/userfiles/3414506127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=transfer+ipod+music+to+android+phonePDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 10904 bytes
SHA-256: 2e25eab963985d224bef33786cb3234c8c932b42a9ba35292707fc3937c98b8b
font_02_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 17048 bytes
SHA-256: 40028dedae0e26656847e68be59e295f444e1800380750b4324c9cecd58503b4

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