Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ac38567253440f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 19:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6477ec1146c29330c0d5f8858141542e SHA-1: f36d0346e121cc87e348d0cca42e888a64a4071f SHA-256: a7ac38567253440fd1857e7ec4862eb50b9e707f9f874e55a7976e5b79a3dc06
134 Risk Score

Malware Insights

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

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://calisnt.com/uploads/files/20191540896.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec20a47a5---92526625380.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/89626257720.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/refinelefozomureluvuziber.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/78080434926.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/90174540743.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/8107069561.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109180108245860.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/25825657945.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/32965383994.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/86468058554.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/34714595060.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210917/16318544973378.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/wugoponotaripezamulus.pdfIn PDF document text
    • http://taxfreepoint.com/file/73551440922.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/kavasaxes.pdfIn PDF document text
    • http://askaudit.ru/price/jepuluxawevututibe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145d23c9e98a---60432406788.pdfIn PDF document text
    • http://ombs.ru/uploads/files/44883423755.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091115342778496.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/73043527656.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/46276639332.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/92307629626.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/78207798856.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/34710624324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=app+to+try+different+hairstyles+on+your+facePDF 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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10912 bytes
SHA-256: 1a7e16b362219c10c50860c592f60b0b32a9e05abd43595ca80b41d8a5194d2c
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 18680 bytes
SHA-256: bfd5237dc82f6bb95e862e25c13b9c4128dbd449b3ee82cb40999c079866899a