Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df38e1192574308…

MALICIOUS

PDF

90.1 KB Created: 2021-09-18 10:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4e29ff9f96175df1efaeaf14c7e7c09 SHA-1: 18aea4fc542e9c120070db8b84e6648296155933 SHA-256: 4df38e1192574308d5e16b5c4e9b136331103d12e2db42affae014cf49285596
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for redirecting the user to a network of URLs that host further PDF files, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326aee6f63a---luxigodurusanuzupogixit.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c8766395---35538421668.pdfIn PDF document text
    • http://santeh.md/img/files/wawujedode.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/6471794094.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sunitukowipikuxab.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/77689582534.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ruzitukememuj.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/ruzumatolagilagile.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/34977005697.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210917100345.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/98656148198.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/xijebuteluredixobifeb.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/90621668287.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/fititaronojesujexezi.pdfIn PDF document text
    • http://slovoveri.org/userfiles/41478667461.pdfIn PDF document text
    • https://kulittelor.com/contents/files/30405905632.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73741658790.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/jotuxenadufomelugonaro.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/2185930340.pdfIn PDF document text
    • http://anninh247.info/upload/files/75744306619.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/48288157502.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/40058747120.pdfIn PDF document text
    • http://youil.org/userData/board/file/dowuturabufirofajasav.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jizopopewavup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=interstellar+1080p+onlinePDF 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_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 19976 bytes
SHA-256: b4d9b95cdceda2ad97a4d631c98abda109e54de3c866c8e922717ca52ad82d6a
font_01_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14122 10580 bytes
SHA-256: cc52e484652f9d416fde81d79bdaf917652373165f2dd92d4226e8043344d71a

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