Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d07f1405e9db9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 09:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be42c38bcfc123df27542a30d7579312 SHA-1: 3b6e493cc4c59fb7a353e4602ccb1641df5a18bc SHA-256: cc3d07f1405e9db946d796cc1feb6240dc384285138637b0a2717a65068f4db2
174 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a high-risk heuristic firing for a random URL link. This link points to a PDF hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://worldtradezone.com/userfiles/file/21062098810.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/susejemanidodojojimuzisu.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/65915450352.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/32188903088.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/72935147902.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2649dd2ae050221d407a5e35f6eb33d9/dositisegetijukade.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/wexejurodopoxutewadujenij.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/28288000781.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/mazobifumipi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/nipeluwasutedevokevanub.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/befejo.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/kawifuxeresejuxesusu.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/53577132666.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/ragalotuj.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/12832400553.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/bekunurowo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141033c10b07---57126519750.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/24693630653.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631557683hAgu.pdfIn PDF document text
    • http://charontrade.hu/data/file/8939875944.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/43523905330.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109061307166531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nba+live+hackPDF 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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10012 bytes
SHA-256: d8a28eb01481b3551a0a1d9ba6d6a42fc1064958a4362bdcf8e798722a8b3ec6
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 17664 bytes
SHA-256: c5eee5a6362a6edb7a3f6445ab629af8761c0389d176cc6cdb6cdc7bb4a2481c