Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ccf5d522ae2dc4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 00:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a693b42b0125f7bce1561c8df66e7c1b SHA-1: 5edcac974f6b3fc2ba4e9d9371db770d8c1b48d7 SHA-256: 21ccf5d522ae2dc4d1c34e26fc928dcd91a3de5b8a6f926cc13b5cf9120c4392
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=baseband+android+apk PDF link annotation
    • https://fresh-cherries.com/ckfinder/userfiles/files/17413562352.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/nigubax.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/fijapibitololulogazavam.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/42183980983.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/17639a9d4b2e2a9bb1b0954524f07e56/89839755506.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fivobobezomuluperinoj.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/50468384112.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/63486079724.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/8658732749.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210913231154_1491610669.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/13069552028.pdfIn PDF document text
    • http://d-innovation.com/upload/files/96328128639.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/11922235427.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/15307920912.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/sizobofamafetuvisefe.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/41051564543.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/69189115057.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///bosamumewotubefufunadufo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vagedijolaludevisoguzodow.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xakux.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/53810665848.pdfIn PDF document text
    • https://taperagi.com/contents/files/fiwerukufilek.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/dezixabuk.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/90787778052.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 20852 bytes
SHA-256: d48e5fa50a17be5e8c9cb089259910bc3a1f7d3dcd7bda1446979aaaa465125d
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 10528 bytes
SHA-256: f4192ce7d2c75db7c95e71f8ea675b58ed71b327af8b09f72900c1d9262697e7

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