Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d43531ae12b1cf…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 20:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62041c371202c7a46365d5ac1d641eef SHA-1: bcf81587b9e8f9c1e1eb815cfdca03c1c8fb0c8a SHA-256: 06d43531ae12b1cf4b972e282ef88f1368f72502400a39485b9a3b58c9546882
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF utilizes a link farm technique with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The embedded URLs point to various domains, many of which are unknown or potentially suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eyescare.vn/app/webroot/upload/ckfinder/files/dukoxisadisuberaka.pdf In PDF document text
    • http://miraesusan.com/ckupload/files/48175516434.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bideperaxikag.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lepalazomigusurolax.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/nanamunala.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/73473404969.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/50510220694.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/68337870220.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/vokelewolixitinijita.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94008884447.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/sopixalofa.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/99624472645.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1t47pm8gb1vsgjmmtik9fh62a2/50980814722.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/munebeduwolenorexo.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/31512652311.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vumifubogefubitul.pdfIn PDF document text
    • https://protum.se/file/60927369850.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/54635929887.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/nexug.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/249271459.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/defudov.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/14537521822.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/meborefuribika.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/75165760174.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021912149213732.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab707b8944---30563729046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=video+emoji+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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 10196 bytes
SHA-256: 7525417df81b8a3b22a6938f1fbac278cb2fc4f742fc89aaf6eec4a22d951019
font_01_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 14736 bytes
SHA-256: e62fb371756efeaa8ae5ab9afbd82c10095c5f592039cf2f12336d65196d0aab