Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e711ebe3bc4e7e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 19:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4df6715352250bcbfd1f14bc98743f41 SHA-1: 808ec91eb2c750f99914496371a9b0388724ffdc SHA-256: a1e711ebe3bc4e7ef94af5804831a9f3c0508ffdaef538eb8bb3f5c6b4b985d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments, likely leading to further malicious activity on the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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
  • 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://philabc.ru/uplcv?utm_term=minecraft+mod+apk+download+pocket+edition PDF link annotation
    • https://questyme.ca/userfiles/file/zezadozeduriwitid.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/limopuwilonadagusulaveko.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/15492736196.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/11003747566.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/kedevifeduxatilise.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/68869696689.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/76341849935.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971ea9261c---55203185607.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/68454971458.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/xejosemetazapovusu.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/sazamago.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/67867059866.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuguboruzaxozijirakamuso.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/73602543200.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/40365283749.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kupozuxiwufemivasawaravo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210908/file/16310532209704.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c244f58---94002926266.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/nomijofirovisage.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wulugofiwusamonaw.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gekibiwatu.pdfIn PDF document text
    • https://cncunse.com/d/files/1101686186.pdfIn PDF document text
    • https://redac.ch/upload/dodutukujum.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/81792128396.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109140329175371.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_off0000c052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC052 16300 bytes
SHA-256: b692c3f41b8e7c2b05cfd313e291866d2eb62908e2a3228cbba8b3ba4c1375ee
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 10784 bytes
SHA-256: ddd44f3307219e903aa3c322f4b5990f21914b9fb50f7afbc9756dbd6f110a8e
font_02_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1