Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4f23a7a4e402a0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 17:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a04a3201a475dbe8ed05f9f62a949302 SHA-1: 7fbaa18c0346858329299f78c686a38a0e127070 SHA-256: 9d4f23a7a4e402a0cd53c9072a5b4b010c269fd6b38277e914a50e9f5dc8a1bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, and a heuristic identified it as a link farm on disposable hosting. A 'download button' lure was also detected, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the detection suggests it may be used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pieseautocomenzi.ro/userfiles/file/50108562256.pdf In PDF document text
    • http://srividyaastrology.com/userfiles/file/37037006100.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xazegerotenapukojik.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sebokapabavigej.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/56381614856.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/ratakakutolozutuxob.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ad5636bf---matubezelifafizasukulu.pdfIn PDF document text
    • http://darec.sk/files/files/86966702504.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/41228864777.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/kutimumowonoruda.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/82870726649.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mapave.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/denojaril.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kufuvozi.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/28435952907.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/giziratibokipanikekaviwif.pdfIn PDF document text
    • https://umartravel.com/files/23678226733.pdfIn PDF document text
    • https://egca.fr/userfiles/file/feduwigepi.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/32968752956.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sovasibi.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/83078693403.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/kaluweximinixedejajuku.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gopevubovegijujadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mp3+song+download+mp4PDF 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_off0000c7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 18124 bytes
SHA-256: 68cfc902d365c19009c887f173fa3cdd7b680c11bd39c967d185224017c2f478
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10640 bytes
SHA-256: 175c032e43682c0cd2fce600538bbd1d294ea72790ecdefdd36a5e7189161acb