Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dab30ed47229ab8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 22:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d526732ac47a7de54f8e7210512575d SHA-1: 88b7fcb0625016a9fca699d92aefa495126d1b02 SHA-256: 3dab30ed47229ab8cdfd7cc9754a934af93a3ac6f41d3f385938f03df8a3dedb
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 URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=how+to+clear+cache+in+android+studio+programmatically PDF link annotation
    • https://pagodatalk.com/_UploadFile/Images/file/wefivimobobokerotite.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/64104199081.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/tenusupunusu.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/bofupewazaxevolabibizek.pdfIn PDF document text
    • https://diagoldjewels.com/userfiles/file/38738877129.pdfIn PDF document text
    • http://web5gstore.com/Files/files/famagenadad.pdfIn PDF document text
    • https://emenu.hu/editor_up/sutelejeroze.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/96196628759.pdfIn PDF document text
    • https://manenshop.com/upload/files/87151396033.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109190859325052.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/jebizeri.pdfIn PDF document text
    • http://askaudit.ru/price/89666382392.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/39022896800.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sitawosaza.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/69962092030.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/zukesotujotug.pdfIn PDF document text
    • http://domuran.pl/files/file/19571594657.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/jimupuxizixezigazib.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/33477807407.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mofiletelejalume.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/pewupawogonudifupadegu.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/4887115533.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/85579330084.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865f34e885---40967823570.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_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 18704 bytes
SHA-256: 72f99f523d375c950bb1701c7a94b43fc2838ece73d803775dc0de9a10695113
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 11252 bytes
SHA-256: f425d9deef19be1484731fb28c5084976b9439f54f4797c820bcc3bdcff74f81

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