Malicious PDF — malware analysis report

Static analysis result for SHA-256 7276b83e34838e2d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 04:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0731638a5886f8f98a8ed57baf9cd11c SHA-1: d992bbf792a3475055a368feda95ec499a51c249 SHA-256: 7276b83e34838e2d2bcb9200cb82a34c63a0f3e1988d0c88628232cec53ad834
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://baovecongtruong.com/upload/files/3472658427.pdf In PDF document text
    • http://www.frank-diagn.hu/userfiles/files/relogu.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/kukel.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/winebunagavube.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/petovemuwuzibawuseruva.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/jugusupeliputokaluzuvos.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gutaviti.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/20007789362.pdfIn PDF document text
    • http://biroestarsa.hu/uploads/file/juxoporedi.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/582974827.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/93641995387.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nugil.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zodusefojetobulalanijan.pdfIn PDF document text
    • http://meskerjager.nl/media/files/11351843864.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/wugugidak.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bitemawil.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/retimezegizibexosawu.pdfIn PDF document text
    • http://wuchem.com/upload/files/27940454242.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/75356613164.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/tapilubikulumifebav.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/mirigofexulokuzuteja.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/80828002877.pdfIn PDF document text
    • https://loyd.rs/images/file/gupufaluleta.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/bigesizusexaj.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/masesavisaxorinoxufaruja.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4418579358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+run+old+version+app+in+androidPDF 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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10628 bytes
SHA-256: 522a592f4a78671b63433ad4c3118150dd0ccb049dffacbbb0d2fc8a5167ec45
font_02_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 19408 bytes
SHA-256: ef238856f4b8582cab8c7e21cd132aab7aee90bcacdcfbeac5d7390a1720405f