Malicious PDF — malware analysis report

Static analysis result for SHA-256 09df3c42b4036d86…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 14:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e8544b4dba6d8541a428677a1940e40 SHA-1: 39c010c5b2ca33124e534d4116864238870c9d70 SHA-256: 09df3c42b4036d86a321dea077cfe4d95c8580fe89ae06f349a1d987c34aceed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as malicious. The PDF contains numerous embedded URLs pointing to external domains, many of which appear to be link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

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://inwebjor.ru/uplcv?utm_term=bpm+analyzer+android PDF link annotation
    • https://opescom-store.com/uploads/FCK_files/file/bojabovedo.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/nariledam.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/bivusoxisozusazixavikowev.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/84527764682.pdfIn PDF document text
    • http://opsir.eu/files/file/rilumijevokukitib.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/66679150644.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/fiwafuwamezefok.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wewewazareja.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/63101474578.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/48926960236.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/18298259664.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nenalamatusewurivor.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/gekuwe.pdfIn PDF document text
    • http://xenangheli.vn/public/files/kobizusemotetudaludo.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/89754016418.pdfIn PDF document text
    • http://rjt1.org/upload/files/defopiredaxipita.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/28444515065.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/jukivogajubaginoso.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pamokede.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14201854163.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/51534037489.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc86e84e9---50126915253.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/19101037449.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/87952067748.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/rofonopofowamar.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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 17360 bytes
SHA-256: b4bb59f66624321420a01251f317e29c8cd0766f8ea8ec176cf3a6510864cfd8
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 10512 bytes
SHA-256: f3e6f3b4f30ee4363deba0dd02c2567818e435bac567b0617bba8b07d05d68c7
font_02_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1