Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65acb9d074e336c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 19:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fba059985d13c126105d258f9f0bbed SHA-1: 6456ebd6acf67e3599f06597e87e1a95c21c7fd0 SHA-256: b65acb9d074e336cdd9df02aae5f5fc64ebc32f29e81e0229f844fb5e363c658
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating a malicious intent to redirect users. One URL specifically mentions 'video downloader apk full for pc', suggesting a lure for potentially unwanted software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=all+video+downloader+apk+full+for+pc PDF link annotation
    • http://jyjwqj.com/uploadfile/file///2021092918281053.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/12811613370.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/fixedubiraturidito.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/zorixa.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/38118328308.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/semexel.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/dosopujonu.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/fagubenilitivakemaneza.pdfIn PDF document text
    • http://btfa.tw/upload/files/fafufilulubedejaxe.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/jusulobuzutisi.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/57827989239.pdfIn PDF document text
    • http://homeopathyhk.com/files/78289917478.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/gexijelufawukulipimis.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/413d5ee43422ce4285c2109c6bd55675/63554132753.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/lopanasosozasokulezanu.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/50869385618.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/4255841378.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/nuzoviranuropu.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/reruzuwupiluzagowifesu.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/dipolikaxo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142401bc8109---tufamorafipinad.pdfIn PDF document text
    • http://mylodge-naoshima.com/52074225577.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/71850183404.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/67018654101.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 10672 bytes
SHA-256: 2ae30dd82542431e413c59839435b554a14a6f37f017f6d2484e3e26607e8cb8
font_02_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 17280 bytes
SHA-256: 17b67f3e6b1c0cdb088ff3dcdf5a3581b5bbc31e7bf06b267a8c7c0dd1e392a2

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