Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34307d8d7d3daaa…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 02:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f9698e404b64873436cea62f777770c SHA-1: 1599ab8497d0a68914756cc92e887ed9c2934c05 SHA-256: a34307d8d7d3daaaa10741871a20ce74dcf43b895a4761d59b87f8d6466dc18d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=judiciary+system+usa PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d52f5b7441---65962197706.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/bifunapiforasupolo.pdfIn PDF document text
    • https://suncables.co/images/file/jumabifawabilelonoga.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/28758334964.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jefurevinakivusulurusid.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/gatofigosatopalisud.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/44983466704.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/luxavididemis.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/16464439173.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/dawafima.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/94864433577.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/7519206559.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/valodijurekipomibaza.pdfIn PDF document text
    • http://congluc.com/upload/files/89037099892.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/sixib.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/85968938106.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/28073444777.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/pogolotelofazonig.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/xofusipojejukuzotolenu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f6a4505bbefb31f7a900c2f652a6b47f/saxogatelaripanopaxo.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 18036 bytes
SHA-256: 892c876bafe2c1f8f237b3629666b09fd2f7c7b10b4cd4e4e0d523e5c2b9a762
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 10468 bytes
SHA-256: faf0703f772d3ca51ccacfabeec3cc2c771df32e926989b0fab400f1ef876985

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