Malicious PDF — malware analysis report

Static analysis result for SHA-256 a251b7d9ccea4099…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 02:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba8db2dc350a5ef95b7adcc66ab7351c SHA-1: a0cd134f5ea7dcbf0f4d22354d96ef0eebc8018a SHA-256: a251b7d9ccea4099147e82b49038eed504297ff5d48724c00d4da2f3d0a40823
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable domains, suggesting a link farm or phishing lure. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into clicking a link, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tycoonmedical.com/userfiles/file/76687218050.pdf In PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/52026732736.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vozujivirebixesovetewow.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2ab82d4f---12189138661.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/8760552038.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a9338af3---56272385001.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/99066884411.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/76867090425.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/lesijivi.pdfIn PDF document text
    • https://emenu.hu/editor_up/zijije.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/16897853486.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kugebi.pdfIn PDF document text
    • http://soupworld.de/upload/file/xiridomisaxusumasun.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/68827335479.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/madulavoripizezi.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/temosoje.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/5526365099.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/9002361976.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/25957077008.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/19863477183.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/94267693710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=apk+dex+decompilerPDF 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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 10320 bytes
SHA-256: 47c4e1222d69aa654c58990868aff8aef95c079c456b853be399a0924ca7e134
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 18164 bytes
SHA-256: d964224f6d5d7a7dcecc84e5c85ad82c9472784bc1c747ad52c1ddf262b5c186

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