Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2ae2af8072aaaf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 07:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4679e13b7b63728e115ed38abf12ece1 SHA-1: ea250aed3f9ee9b929870f2b6f48fd049615e917 SHA-256: 9e2ae2af8072aaaf64b7af10f80d4d992accebe5a9f2fc6653f3d92aa10d4e87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting, suggesting an attempt to obfuscate the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://lnv-cnc.com/userfiles/file/81450041993.pdf In PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zodibuvonimowaxe.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/diralofu.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pefosalazogopik.pdfIn PDF document text
    • http://potya.com/kididipomezupusivem.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/86272510806.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90946031516.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/xebok.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/29487420089.pdfIn PDF document text
    • http://ihdbd.org/upload/files/buxinudixukapipe.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161365e7ba3a65---49240732809.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zaxofim.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/89114612942.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/25904097480.pdfIn PDF document text
    • https://edusfera.pl/upload/file/27548178608.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e794b278807143ea3549e0d5eae4a495/42576343777.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/vivepisalumufew.pdfIn PDF document text
    • https://fasleh.net/Files/files/vatelikitavuxobuz.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/44398529987.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/jafitorekeweropapolum.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/43634996598.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zapomewasetu.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/49902042407.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/14437798332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=which+camera+sensor+used+in+redmi+note+10+proPDF 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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 18604 bytes
SHA-256: 3e0879e785b9aa758db90594a829a2d74e32e847cb308cce9cb67fa0a2dad8ba
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 11000 bytes
SHA-256: 0f00f34baeaee8791b750f5f4a93a84b9c39b177e07eed8132a5797810ad5ce5
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1