Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4e6fc9ee140d20…

MALICIOUS

PDF

96.2 KB Created: 2021-10-17 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8326443cc44cd5c5f1e1c1d910b65a70 SHA-1: c71242d76f398e02020e5d68c5e482c02851c846 SHA-256: 3a4e6fc9ee140d200e024358eecbd5f63f067fcd9b07e374e3f9312264de8c92
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avsa.org/sites/default/files/images/files/labajule.pdf In PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/6382608639.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164bf145ec01---74206941263.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/76164254699.pdfIn PDF document text
    • https://oasis-travel.ro/files/2261036729.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/musufojidoj.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/gifubifagefo.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/98609397231.pdfIn PDF document text
    • https://hoavily.com/uploads/files/174760977.pdfIn PDF document text
    • http://santeh.md/img/files/vugit.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/sezeduzojofafetatuva.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210907_5AE550E914605214.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/karewazudaxapomusi.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/bubowigafefa.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/lifupejaxarosediwirinu.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/7718686327.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/sodemex.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210926/16326382531883.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/mumoruposiwavujiliv.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/mesogifituwejosovikowetaj.pdfIn PDF document text
    • http://ipceurope.be/assets/file/58506740672.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xuminizugew.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/91581321951.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/bigawokamuzitelafuzilak.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/95014830121.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=songs+in+sonata+formPDF 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_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 10452 bytes
SHA-256: 5179f70b7bf166ee1e829150fcd9cac921c99a71b6b2c40cee4d5828317e0a4e
font_01_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 18216 bytes
SHA-256: e4a1ef26eedb99db7842f32965cc5cfd540a922b1957c15f453727eee1c481f2