Malicious PDF — malware analysis report

Static analysis result for SHA-256 031025439099b8ac…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 08:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb2d8b7758e449b287ecce95e1bc7131 SHA-1: ebf0f981c1f656d6f52ec40755d4c71369562307 SHA-256: 031025439099b8acf1624564e6a99fe389b724618072617d880d851ec8a4fe9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=best+app+for+recording+songs+android PDF link annotation
    • http://zoncmswebsitebeheer.nl/files/editor/file/saviwigutikozoxojuwem.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091004043530170.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/xuxogusidexozujapu.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/nogox.pdfIn PDF document text
    • http://coachhouse.info/assets/file/89549926970.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/86530306349.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jezurobajajivofubiji.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/senadoxi.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/ranomaduxuwolulibanolujo.pdfIn PDF document text
    • http://health-bridge.in/upload/file/36234980738.pdfIn PDF document text
    • https://gangnampools.com/contents/files/89931579102.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613727a187d3a---31654960975.pdfIn PDF document text
    • http://dakov.hu/_user/file/96676773830.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/97997376967.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/newum.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/9451235949.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/nogedetofituterow.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/xiretejenobuvaruditek.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/nalurapiw.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ae358107---96582660901.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/notudi.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109051346004147.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/bugonegezajunesibarodoben.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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 17408 bytes
SHA-256: 6c341fe3e714529af8694727bcca4b21c6fa87a4eff90c4ff248689ae28941a5
font_01_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 10804 bytes
SHA-256: 76b27c8d1dd25b99ac2ee7ccede70a7eb7d85245f17f9557a545f482e2e52ddf

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