Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d48dedd994ada71…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 11:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8864875686389dc795d58066d922166 SHA-1: 8f6041ce3005b8d6f839d92c19012bf07b534237 SHA-256: 4d48dedd994ada7155082ec20121a8f4025a6cd37a5e2c6ad0bd735ef93e30da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or malware distribution, leveraging disposable hosting to obscure its true intent. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=android+one+boot+loop PDF link annotation
    • https://betenagro.com/sites/default/files/file/34734334192.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/wojupa.pdfIn PDF document text
    • http://teresachild.com/upload/files/senejamalo.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/25129543371.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/50456116725.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/fexakavudu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mikofigogirebav.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/69547714424.pdfIn PDF document text
    • https://fptica.ru/images/file/68218278134.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/keritariloduvumuv.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/54823055688.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/69656512578.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/77106829268.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/somawa.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/77136901902.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/dekebesage.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kerimugegolafozoxupobof.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/tulox.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/7702572599.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucbddfu2ehfdalsrd9frgd1d02/13764403910.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109021702107716.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109150309108865.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_off0000add7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD7 10176 bytes
SHA-256: 643a7556ee39b5bc48513f36322d76bd75c8b0bda39df51af6aef83e013afffd
font_01_sfnt_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 16996 bytes
SHA-256: fce632289ba305484ecc1885171d4029d68fa16a9893c215a741f4627da09bff

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