Malicious PDF — malware analysis report

Static analysis result for SHA-256 985cd76e45576c1d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-15 21:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef72ca8f3790772c8b9484e3527cdc13 SHA-1: c0c7f63b7e8a8cb9a55282599ed9569801fe98b4 SHA-256: 985cd76e45576c1d9788a59e7e889137a280913ed99f136f15187f417939f184
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to PDFs on distinct, potentially disposable hosts, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dubaimotorcycletours.com/uploaded_images/files/29548011765.pdf In PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/47747737420.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/74530653448.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/32739144992.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/jeter.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xopowobafonoxusawofuwav.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/97172516243.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kanonejagas.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/26440242668.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/buxukikivikidezaremofo.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/fifazigujisekavo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/32321139718.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/74973086183.pdfIn PDF document text
    • http://finchamauto.com/pics/11649092975.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-14/20210914025816783964.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/97946191935.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/govotepufalile.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/48223546952.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/fovejamekemoxizakujorojo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33bc8f31f---1478230320.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9b43bd2cb4d6ea6dd767f8e390c93ac3/wadebarimonulomog.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/2892371597.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/5420376856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=descargar+slime+rancher+para+androidPDF link annotation
    • 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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 10864 bytes
SHA-256: ce161c1fa49b07dc587453411af18c2817d498850647529c0159b09323f19069
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 17392 bytes
SHA-256: 455f4eb3b6b347e98e89a2ae4c50dc690214ea7ce9790c8a0976584229e5109a
font_02_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1