Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fbd650af7ffed8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 07:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cf8ee748c2fc595b0727591ce9d431b SHA-1: 13536a23b7e6bab08a235aa07e04ebb03af2fe57 SHA-256: 90fbd650af7ffed8fdc57df0d763aa65a1a3fcb3fada49c1d4835ba33015b738
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=cast+to+mi+stick PDF link annotation
    • http://elfast.ru/userfiles/file/10084364334.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/64434036809.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/luketajodedixovigewemagaw.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/64986576805.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/72418429687.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/jamiraza.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///43326638825.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuvafawowejoxekulajabarir.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/67466994620.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/pimanomowugon.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/mozavowenagedubutudi.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/radagejugobazuraxelefi.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/92330544781.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/xikusosediwigakufos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707b039892---1344579853.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/palibegiwetaleludonipu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62533082835.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/87757525347.pdfIn PDF document text
    • https://megashina24.ru/files/files/fajelavepeveguvomosokifun.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d585781494053d0c00b355e2ddd4a03a/kezijor.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/senon.pdfIn PDF document text
    • https://seikai.jp/free_images/files/5771467366.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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10132 bytes
SHA-256: 2ac8daa9ef0fc6767e7d3e828819ac274d649d5be8718d544c57b43550da5a7b
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 19128 bytes
SHA-256: 87f9971707fb1101fbbac4eb0a474f67a9f273b9c0cc476ed485791d0684082e

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