Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42ea2cb6c8ce6ff…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 13:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 038e4a2f9ea95de761ed99db6e45b1ab SHA-1: 8eef524b34148aa2421ca3af3f34f829b04a5ff1 SHA-256: d42ea2cb6c8ce6ffa494153e654d5eff2fd75c0b3cd333987795e337a90db4ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=messenger+has+stopped PDF link annotation
    • http://thietbiantoanttk.com/uploads/files/xifepamerenedonobabogibuz.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/53348016809.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebaa6151---wesusapelek.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/wadulutulurajofubugaliz.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/12076198308.pdfIn PDF document text
    • http://dd-eng.com/files/files/854854770.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/3796452935.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/tavulizexejidevowu.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/18332553865.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/54385348644.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/tejarilafudojiluneb.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5be4c8b9---30488422685.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/dabedibuseba.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/21207444400.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/14538996976.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/morevajiduvikoditedede.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/gexomamogewizekugut.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/87529678917.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/79032171686.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/74516050900.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/1263591471.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/22590006980.pdfIn PDF document text
    • http://risme.vn/files/wofasotavufo.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_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 10528 bytes
SHA-256: f23cd1be6d4ce3d4c00a40af7e6f332ad638731edda877b74811e5a76eaac703
font_01_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 17004 bytes
SHA-256: 38d676ae5b8300b654eb4b7a29efe49057612aeaeab7b04daba41a6747b98671
font_02_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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