Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67ac3bd37ac5949…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 00:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8ba1af9012b1f7e9655869f7b261596 SHA-1: 4738c15084153a8c5c61a5413f46f1d56c46af2a SHA-256: d67ac3bd37ac5949f2fa53266795d6b5ab0fe17038d750c52a069695ad68b321
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://quasar.mago.ro/ckfinder/userfiles/files/dofusanagirawe.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebac3e5409---vopubopukolafasezuf.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/vopiju.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/repizeratomugupokezak.pdfIn PDF document text
    • http://africareview.in/userfiles/file/talilorow.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/93280446724.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/22862354222.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/maxedewenataduvagunojitu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tufovokadodirajugizegira.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/27136233956.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb83322b2b---lifodutigalebubasiro.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/rofogiganemapanuru.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/lojerelaxomotojazefu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wunulepozenenajubuvuraz.pdfIn PDF document text
    • https://netlandschool.cl/files/49635833333.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/suzujise.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/jeminakexamijatemafopubu.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/daxekajexaxofozojugo.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/95053478674.pdfIn PDF document text
    • http://ktcz.eu/files/files/solidanaxewov.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/rilijapebovo.pdfIn PDF document text
    • http://dentali.cz/files/files/bumokuruwotojibozadedu.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/10851180438.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4567004967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+create+an+android+app+step+by+step+pdfPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10900 bytes
SHA-256: 3d0b6b77175d130c3955b2ec62633e1535a87c92786f9b80110de7edc7b5ed6c
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 17900 bytes
SHA-256: 4c8d2aadf24c7248d16a45d3ae602e69c9ea497a4fefe796129ce343b7cbc33c
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1