Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24ec66782996812…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 08:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 355c3f1898912e4fef5180926b31e56f SHA-1: 37e15f19f9900c5f3b1f31751c108113c55dc2f9 SHA-256: e24ec66782996812c534e70c4101d5b27397584e0c0ff45e18ea78ff2d64045d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, with one suspicious URL being http://acunambalaj.com/adenoto/upload/files/sogowatonibonadopilalap.pdf. The presence of embedded URLs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://acunambalaj.com/adenoto/upload/files/sogowatonibonadopilalap.pdf In PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210913_AE8AE216A22AEF4F.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/86231088658.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/melimab.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/zoguzowilekape.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613488a371902---50353132676.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/duviposidaserunukukal.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/35189634681.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nuzeluzosemulomorari.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109060220263222.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/65461179536.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/kisanipepuxugilod.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/99602486951.pdfIn PDF document text
    • https://signika.pl/Upload/file/80144972534.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/77987713730.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/22422239486.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/23639697493.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/44230849038.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokik.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vixezonapogimaw.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/piruxozitipuna.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/werelitegapixopulaluzeg.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dagivul.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/30897720106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=find+saved+passwords+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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 17948 bytes
SHA-256: 27d81e6516f7cc808788c9c24b98c053ca5e602ce7852cffaba08e4c7de6e55a
font_01_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 10372 bytes
SHA-256: 0f6022250dad2fb60a9229b4711f400a65b052f726a46ae290a7221faf1610f9