Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5b70ba2eaa3672…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 20:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec8f8bcd5f921000a1c4452293c84f13 SHA-1: 1aef8f13568a994c788e38b9ea72345d729019ed SHA-256: 9d5b70ba2eaa3672131ef3f298bcd5d1ca219f90bce14c72184ef7deb0ae7d88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of multiple unknown URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dogulupuzetudufof.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/loligabinitatawemafubuveb.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/majezonizutoxedaturewada.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/musukawenuzerudedunab.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/24218221625.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pudutukixufigabifijo.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/voxezegatodedaromifamad.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zupokapuperewetojamo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/jumixuguwazexefinurofized.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/jimisokimofadoregakoma.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jobazezer.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/58693303100.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/55642327056.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614751524ebcb---batem.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/62331864217.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/4790552209.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/basokuragobelifekirose.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210905_2C03960EAF98FCAE.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/93284443344.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xuzetag.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/88059667695.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zigasibewosuf.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/32204928254.pdfIn PDF document text
    • http://mfahk.com/upload/files/todezufinok.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa6af25d3---jatunekevilubexirujuzox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=love+in+time+2020+eng+subPDF 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_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 10648 bytes
SHA-256: ab286d1bbae66842019afc540a4ef29d91c070a2553f998504e797a83ceb07cd
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 23044 bytes
SHA-256: eb32ef6981fded9d082255e63e2d82cf21becd9b4835785d4f9a6bce5de7e7cb
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1