Malicious PDF — malware analysis report

Static analysis result for SHA-256 90930c0b38297ae6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 10:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19e1c7b36ce0abd323e2264b7140fc97 SHA-1: 8c11fcd80522ad3204cc8e02239cb8c6adbea604 SHA-256: 90930c0b38297ae6b011cbe884a5d100243f4d1fb5ce620d858b0205886c6f6c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The PDF structure suggests it's acting as a link farm, directing users to external PDF files, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://mengnuanua.com/app/webroot/files/files/wejewoxim.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/89065701384.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210925171532.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/33058750238.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/21018684046.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/59803278324.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/50931071719.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nodejebapasupemalolawux.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/filufulexejizopemexud.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/gefijikajatodom.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/40227459402.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/3580871127.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/9930050126.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/78546521454.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/darejanubiribenogiga.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/44883422021.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/fewumujof.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/kufudinim.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/tuvibevijikupimerozigowit.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6f8d96942---98443299764.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/14494257308.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/23872299449.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/xesutepoxavujul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+transfer+data+to+your+new+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_off0000af7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 10748 bytes
SHA-256: e2568c7fca6675d8be759654dba3734e22518759244a7bee4fae101dfd56ebc0
font_02_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 15804 bytes
SHA-256: 32b199971d2733faba9da9b31498a1478e6f652730c68243d7dbd96cbe8d44b9

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