Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e3746eeaa0565f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 12:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5585dfab5f0841077aaf4772adb1092d SHA-1: f90bf4b0e85c369dddb00f7bbbe4ce76a550bc76 SHA-256: a4e3746eeaa0565f05279dfb1b394861e3e87a0b9f4349330f52ee04f7495dd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code within the user's browser or PDF reader. It also features numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=dual+install+ubuntu+windows+10 PDF link annotation
    • http://thaifilmind.com/UserFiles/file/nirekujusudowisos.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/19939165205.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/90165210534.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/soden.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/8290253817.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/vevoxeguxosonowom.pdfIn PDF document text
    • https://congchung7.com/upload/file/56342867496.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/38938079790.pdfIn PDF document text
    • http://wjcopy.com/upload/files/74679751226.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/15003253118.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/newavikefe.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/49532887323.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/mimeb.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/lilizuxorimagimojugujajaw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e99b56cd7---xaxotutep.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ofnjkmi80m9soh2hqnu27mkifg/20015355974.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/pobaxadufa.pdfIn PDF document text
    • http://sinners-party.de/media/file/95396581365.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/10966735973.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/18410267971.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/refede.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zufarikovudoto.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zukesapimot.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/tobod.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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10512 bytes
SHA-256: 0a9dcdd9a674dfadb24dd96109e340866a2d504c7adab81f71dc1c6f94de81a0
font_02_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 17956 bytes
SHA-256: 65792f79ec2d9628d51ef55e2ef0f7ace29b42313d847514e744c2356166629e

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