Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1cd7eb64b071c3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 12:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dc90fc5e509d7173a6c22b239ee0d0a SHA-1: f2787f123a02903b9f0106c989c8dd0a807f8b90 SHA-256: 1f1cd7eb64b071c31612c58d9de89a17fa199108a011ea1562edb62a6bb59564
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://sofupingame.com/calisma2/files/uploads/wonofotagonevu.pdf In PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/57931709544.pdfIn PDF document text
    • http://regmac.net/userfiles/files/23097643987.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/sogidasexilaliziz.pdfIn PDF document text
    • https://ocw.tw/uploads/files/tiwodikovu.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fewum.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/kugebulor.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/73148997544.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/46219929295.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-13/images/files/18730223956.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/47234136938.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/xulife.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/rebitovos.pdfIn PDF document text
    • https://zhansq.cn/upload/file/polem.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/14430300571.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/xifezeperisenimijidogelam.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39c423966372a063d01a45cf013ef167/11664767564.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xegofimugulumerejojupidan.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/ralomemusexojobikezopiv.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/jajifilubol.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/55493564795.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109022214275971.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/numetapewoselawuxe.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/13998539406.pdfIn PDF document text
    • http://standardamulet.com/files/files/poxotasetogovidozi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409a210cdf3---zavogewimofoxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=crash+bandicoot+rom+pspPDF 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_off0000c010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC010 10772 bytes
SHA-256: 94511d28829a8035a16834d05178b1483a95efdab582d975835ce284de22dd1e
font_01_sfnt_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 17020 bytes
SHA-256: aa45b644da23635ac6163546d60c311491fa62e32796266adb26ca01cbf4667b