Malicious PDF — malware analysis report

Static analysis result for SHA-256 999316cc6ed8506c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 00:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: bf9506d0fc64059c40fb36e39040936e SHA-1: f6c9ecd30587a53b45f8090cad973c34daac8211 SHA-256: 999316cc6ed8506c56ad51a381f12ab64f04baf2125c9f541a34dbd2463e3b72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sonerofset.com/userfiles/file/19081720706.pdf In PDF document text
    • https://rrr71.ru/upload_picture/21968730376.pdfIn PDF document text
    • http://elma1.ru/!upload/files/54400577648.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rewotigeda.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/53216200494.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/59223988458.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/8844664956.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/40361020642.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/rabinavadufovakuwopevo.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/kogomanim.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/rixowisudojiridajimi.pdfIn PDF document text
    • http://innersolutions-uk.com/file/dosogeravabuwojopenonin.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/41954055029.pdfIn PDF document text
    • http://cutskytools.com/d/files/fofuvafobexodovobotovetu.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/95236538219.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/65430696746.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/ribuxobolaku.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/28733369696.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/wuvajulelupeputopok.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/bidogarilujogipetifesigaj.pdfIn PDF document text
    • http://taigesw.com/upload/files/mosaz.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/batixigakax.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/mewibu.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/38028267360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mtk+engineering+mode+start+apk+downloadPDF link annotation
    • 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_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 10908 bytes
SHA-256: b9ec39a8ca8a6b7608050b9be2eb37d76597f2453cdb3b762e02faebd03741b5
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 19792 bytes
SHA-256: 45fcb27f251bfcc598ca3cbb164a5bc2b9c1417dfc320176cc27780dd92fd863
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1