Malicious PDF — malware analysis report

Static analysis result for SHA-256 2304e45d7bf8c295…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 06:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc967e968fe5d4f71cb6971afd6801e6 SHA-1: 939eebb408bcf69d7aaba16098913b85f1e1a538 SHA-256: 2304e45d7bf8c29580b7f36cb4bacd414e0bacba8af02cf6bfcf811082f59b23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The high number of external URLs, many pointing to disposable domains and used in a link farm configuration, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=slideshow+wallpaper+in+android PDF link annotation
    • http://vonschickenfremont.com/uploads/files/62921124335.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091206534851.pdfIn PDF document text
    • http://sjanzee.nl/file/42895706411.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915174955331619.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/1129413340.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/608692612.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/53087671596.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/xokowodikalibojilejozoku.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/denimixonivapezajaw.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/29421540567.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/55966598930.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fepejalukikokofi.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/turujitekodo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0d102584822ac3062c4a7349012c0098/xuruzasumuzepajowenimaxaf.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/87758298075.pdfIn PDF document text
    • http://halanmilk.com/upload/files/74916569765.pdfIn PDF document text
    • https://kapefashion.com/files/files/zujepan.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/buwiwufogotagixaz.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/ralobosutabenuxolarufemud.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/mafipe.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vumad.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7573b620---vewaramaxevozuromow.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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 10552 bytes
SHA-256: 4f60ac270a1c753ce426693cbb0002cc26e224756a22a67e2af476ee46ec9369
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 17712 bytes
SHA-256: f80a312fc048bd04c69c3c6de9aeb0b9783beeef64557bbb1759cca7b37f48e6

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