Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae95dfdcc5be45b0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 13:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4feee1e2225a04a7e143dc27fc348285 SHA-1: 4561eaa90722e48925f8b3bcd29221300bbd0898 SHA-256: ae95dfdcc5be45b0300578a60a86d56c20de4ef1322485b535b4c198ecbaa63a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded links are indicative of a link farm, a common tactic for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=no+ads+solitaire+android PDF link annotation
    • http://poorclarescork.ie/images/rawubawumugomozagubuzago.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/mepukujisedurebivemetuni.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85892e64c---95069416498.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/koperurekovox.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gitivejukizagijej.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/jojamowamosujaf.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210908112248.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/dosederowomebufazobade.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/32860294400.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/88203556181.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908015709.pdfIn PDF document text
    • http://wirheiraten.de/images/file/65079847787.pdfIn PDF document text
    • http://tayles.com/uploaded/tabutabalapemuvi.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/lizirujozitivamapukogoku.pdfIn PDF document text
    • http://skupka54.ru/upload/m/pejeko.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/8059925777.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/78111257344.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-05-14-49-41-73.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/4195862777.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/43649773715.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3bc8b9215340db99d63c0ba3b2922f38/62063887778.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/bibopedazopezereneroguw.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/juxewam.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/76768849968.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rositeforamuvemumuje.pdfIn PDF document text
    • 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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 17252 bytes
SHA-256: bd034ebbadbd714b025752c7759c6c4363654cab5b43230d37a19a3f07fe794f
font_01_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 10216 bytes
SHA-256: 2829205e00efcf897dd6cdd8bf24a515117a6ad8f5b5e3bc3723bbee09a8c091
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1