Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edcd861e79839c1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 21:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9982591f532b4c6603699735deecaf08 SHA-1: e661d64dc23ce03f1bd62711c83e23616ead5127 SHA-256: 8edcd861e79839c1950246aabf4bb51ddc3e7f7e7aaef103a3199aeddfe2bb0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The presence of embedded JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=lego+android+app PDF link annotation
    • http://templeton.sk/userfiles/file/runokujabuwuv.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/538597586.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/tusapaguzofafixo.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/saperupaxuji.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/45825242901.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/366210938.pdfIn PDF document text
    • https://majubesar.net/contents/files/wevuru.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57669793027.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/bevexixelatutomoxamelib.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/xovelebukebanipom.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/88619208411.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/99520102269.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purawofafokoro.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/55263490867.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210914180222_437881.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c710613cd---wagabufomopumokubore.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/8164429804.pdfIn PDF document text
    • https://hsse.cl/files/feden.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/22085789820.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109091520189649.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/muvimumerawedevavik.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/daluregabuj.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/newugiziwonakiroxosip.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/wubovajagidudevora.pdfIn PDF document text
    • 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_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 18056 bytes
SHA-256: 1f5ebae49bd71386e550a1d98917af2c33fdd835f473348c4ada9c17f842fa80
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 10212 bytes
SHA-256: 399d1658eb7f85151cad1e3feaec722839edbb10a945df25400878a5ff209c92

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