Malicious PDF — malware analysis report

Static analysis result for SHA-256 8944dbd35f97c253…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 16:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5eff26e57dbe3377b7f931ccac762174 SHA-1: 91f8240f01c3cdec23f8f310f74f5dae83ee4640 SHA-256: 8944dbd35f97c253d8ae2f6609370c18c88774d17442d672da506813d7392a9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://rld-carbon.com/file/ligafar.pdf In PDF document text
    • http://divorce-difficile.fr/userfiles/file/sosapemovurewome.pdfIn PDF document text
    • http://fnathservices.com/upload/file/33532209081.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/15611458052.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145391315fe4---60290247277.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/78615937271.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bipet.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/wobovafanilaruvedeka.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/pokibekoxuwipatusox.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/3396145093.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/88068528202.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/sapowulifit.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/69978279187.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/dijekirunokukalekixa.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ebd4a9777ea4825fb31e3f820b1750a9/89095150513.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613833c78bd77---pexusebuveton.pdfIn PDF document text
    • http://timocomputer.cz/files/file/5955131065.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/tazewogidi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/22742528485.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/89087561750.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/47349785947.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/90501979292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fundamentals+of+organic+chemistry+7th+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_off0000bb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 11308 bytes
SHA-256: 736c6434c77df08e05e433a189935f74ab7148b5192c23672a76f5a40978b257
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16304 bytes
SHA-256: be81a3a451342cae5ce1271c582fb2bd72bb5466e10f7521a25fad525d9234d4