Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e84553d92fc8b1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 10:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53a4b2905b2948b006292e56e393ed40 SHA-1: 15a8ee62c23e6ed2ab38a60c89813c32acc7d0e9 SHA-256: 58e84553d92fc8b1e230ede6b3bfb11efed800d4e4521031a8c18712948e89b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting. No scripts were extracted, but the presence of numerous external URIs suggests the primary malicious function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=how+to+make+fire+message+in+messenger PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/593f2a3427529aee795e24f04d878ae6/sobafumuxabifanazura.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631318444.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/tunuwositegizu.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/26432010447.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/xeteg.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fubije.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91df99c44---fovew.pdfIn PDF document text
    • http://hasyo.net/files/file/63329364930.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210917010335240518mg9vp5.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/8770842795.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/85645644570.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/89374702582.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/86111222058.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210904063004_ODUwNTI1OTQ5NjE=.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/lalewufekat.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/66599100826.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/31896392327.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/91783887274.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/tabesafirepom.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/21246551774.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nitufo.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10680 bytes
SHA-256: 5657a03f92238cc34ca6a64e93bbb8b38b7a904ce161f852cb63557dc4efcea9
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 19544 bytes
SHA-256: b06f468dcf14ffd68adba6a0552425545eed35a309c30eb0f42c3c78f1855d47

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