Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb25f5bcda6dda96…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 14:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef34458e4283f9a6282fb9a96d6a8424 SHA-1: 4b401e911278fbc173ed54d248e7ea1c93662b0c SHA-256: fb25f5bcda6dda967622b767401dfaafe2855bbc67a9f0955f61e408c4c1739a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=photoshop+3d+pdf PDF link annotation
    • https://dildendilecevirievi.com/upload/ckfinder/files/ruwukuzananasibedupagoj.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/84053180021.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kitiworobezomup.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/97712938294.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/33826513825.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wupujeme.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/73696182760.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddc3bf083---45023479969.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/71651492540.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/22231023065.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/18540784368.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/ximekuwu.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/gokavifijuvorizubad.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/nunapisudageg.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd1988ebb---guxikijiwujo.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/26665766296.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/wedefunawutosow.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/10060207325.pdfIn PDF document text
    • https://deepex.hu/hirek/files/46981596901.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gigized.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wikis.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/97870994793.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/jolixovugutesose.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 17588 bytes
SHA-256: ab623db3710977722102a17a903fdf305e26821ceedac1c5e89325eae3685b85
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10132 bytes
SHA-256: de224c3e0618dec439f2cf532c246d760cb38c7f935c69efef9fa3028761287b

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