Malicious PDF — malware analysis report

Static analysis result for SHA-256 102188d31debd47e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 03:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cffd8f5704f6bf60c3e26019ae355e0 SHA-1: a4b338bc21656bf90a9b297eb527ca1def296ebe SHA-256: 102188d31debd47eb090df0f3adb8ebfda83cc06b4a3d08c6bd0b5058c6c1316
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zespolbahamas.pl/zdjecia/file/46586307644.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d820ac99f9---setekuxufifomujeseke.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sonazafize.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/68777538278.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/zarivezozegekate.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/kewudivezixaketosisovon.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/46942421699.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/gexoj.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/fiwuxevazuw.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadobexubug.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/16832720472.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/javipupibutoxeneb.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/73189921630.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/96544021021.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xojomogilelifax.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xukatumagunugaf.pdfIn PDF document text
    • http://erex.hu/upload/file/83687013435.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/bogapope.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/92494785227.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fkcjvh52aa5a39osncrfrnbtk9/warumevitu.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/vaxekedapubodajanaf.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/460938457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=coc+unlimited+coinsPDF 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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 16948 bytes
SHA-256: f8b469d8f107381f49b6d0f15c7d71edd496864d9b11a01bfe959150035013be
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10400 bytes
SHA-256: 36c546e0e16141204d823fe09d7d9c3ceef49c8032143ce263622e3792d9ecb0

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