Malicious PDF — malware analysis report

Static analysis result for SHA-256 484e8535db5e0a4f…

MALICIOUS

PDF

89.4 KB Created: 2021-10-09 12:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 848cbf8d8213ed81e894c81b7782066e SHA-1: 9065cf4596b8b45a04e2d84f935f9ea9feac7391 SHA-256: 484e8535db5e0a4f7b9bdb8657a7d364d084cf699622e49fd75ae28b9e791abb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=the+dovekeepers+2015 PDF link annotation
    • http://nguyenphat.com/public/default/ckeditor/files/64975219893.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vuburugex.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/larisifaverutagigakunodom.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/24260873701.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/sutigex.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/tedipu.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/fuvoruwagup.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/1474319707.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/58848359217.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/20211041418369993.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/61673220349.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/94956760887.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/39066786238.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/74737714747.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/vamixezepowudovogimufalox.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615626cc91e5d---pudorituroromavuz.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/74602101895.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/letumepas.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524ade5b155---wugorafudojuretabulupug.pdfIn PDF document text
    • https://incense888.com/uploads/files/202110030049326355.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/felirukojasopafepoxom.pdfIn PDF document text
    • https://qnzar.com/files/3631494898.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/39773793775.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_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10536 bytes
SHA-256: a51eb2f327ee8c4379ef774ca5ba726e6ab3ddb2b1529b8a18caaaf0a42a7aa4
font_02_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 21288 bytes
SHA-256: 79a9027410c5ca8216909cb2cd67fb70982d6d5c5d282441973da507a97a8f5d

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