Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e87dd941cff109e…

MALICIOUS

PDF

143.1 KB Created: 2021-09-18 17:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9ac0bc5200af67aea394132c1f50a1 SHA-1: 89fd5669ae6f1499df252d568271940c0029c6a8 SHA-256: 3e87dd941cff109eaa6697c24f46acd1ed1476e2bc1f2ba18ecc26b2f08f0d79
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to a network of potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://websbag.com/uploads/files/72736959590.pdf
    • http://enovosti.info/ckfinder/userfiles/files/75774186469.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2d472311---gugujimo.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/lodavi.pdf
    • http://otczenacts.com/media/files/mazibixokukinemasaloraj.pdf
    • http://pomelieagency.com/userfiles/files/52498242545.pdf
    • http://321eastern-thailand.com/userfiles/files/muxiwekibepavepega.pdf
    • https://denimder.org/resimler/files/78203188026.pdf
    • http://slsnn.ru/content/files/49447568798.pdf
    • http://younewstoday.com/task/userimages/file/damikuzi.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0936151---dasimusunugo.pdf
    • http://beastyenergy.com/userfiles/file/33972556845.pdf
    • http://harrodsrentacar.com/public_html/userfiles/file/kudivulokozuxuretab.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/dunogodubuweduzawizu.pdf
    • https://tecnibat.net/uploads/archivos/97310089913.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/vetajetebivalonofawugisa.pdf
    • https://hgindustrial.eu/userfiles/files/39509037014.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/83174998252.pdf
    • http://www.awakohchang.com/image/upload/File/8988667722.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wadusajafobezijoxa.pdf
    • http://zhengfutz.com/v15/Upload/file/2021932154522887.pdf
    • http://nguoiquangphianam.com/uploads/files/6038945972.pdf
    • https://coebmsf.com/userfiles/file/91494534648.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=acer+android+all+in+one+da222hql
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ccc9.bin
0e0bb8726b5464b06869f63d722da1f2c3c3f0dc126816cc31ea222213976a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC9 10448 bytes
font_01_sfnt_off0001e432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E432 16792 bytes
font_02_sfnt_off0001fc44.bin
e86c4cdc4265413e9d5959c40a462b3807d574c01bf90bbb8bfb417313f47c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC44 19140 bytes

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