Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ddc95ff3bc866f…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 06:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e339f98b4348a04714dfcbab3d3dbd0c SHA-1: 7caa4b944527f88b068f94a4b18e418659a2b245 SHA-256: e9ddc95ff3bc866f2fd66bbd31dffb5f8f3a2078ce04d14e3910af7280c352bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://hkki.org/userfiles/files/foxatejaligerakoneje.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b925a5a5e---21868176724.pdfIn PDF document text
    • https://educhina.mn/editor/files/gilelukijolubutodux.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20211003010113.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/wusoraxavotelebeva.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/zowuvuzagewukizedilufalel.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/zugamekuliwopisatifab.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/59314014829.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/85362660423.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/nirobatusiratunez.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/sosino.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/5470403007.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/86747161345.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/47636471907.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/49621795626.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/14912714977.pdfIn PDF document text
    • http://lamay.de/userfiles/file/nimekasedovin.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/rawifanizubopop.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/97861808675.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/wowevo.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/fubuwexa.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/30202133067.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/dulaberanaxubeji.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/11764104628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+internet+options+in+chromePDF 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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 10508 bytes
SHA-256: d71eef001118306e993c5ba8571eb7990d537dddc3e20248291db2398055c300
font_02_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 16660 bytes
SHA-256: c6d1774ae13288d1f7b0be9c3381f71153c28ae6c218dc507fab925bf1df9b38

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