Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79edb087cf9ecbe…

MALICIOUS

PDF

104.8 KB Created: 2021-09-20 08:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99f76e6197cda5b90dc445c3cc01a0fa SHA-1: d6ebc6e99dcb006ae170194eb69d9ee62f22cfb0 SHA-256: d79edb087cf9ecbe87d676b96a3c0cf0c5b7b6879419c0f8c781faa167f78227
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security scanning by requiring a password for a downloaded archive. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://pistant.ru/uplcv?utm_term=download+game+ppsspp+god+of+war+3 PDF link annotation
    • http://standardamulet.com/files/files/4986794640.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xumeliserezel.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/keridemoxo.pdfIn PDF document text
    • http://risme.vn/files/xupuzutesowomiz.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631358178.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/32957708079.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d22c6b834---volewumexeler.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/31563597662.pdfIn PDF document text
    • http://tai-group.com/upload/files/78380240650.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/72203310710.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/zupogifozakiwew.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/lolelujebi.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/39711115400.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/76227988746.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21b5ea79---fokixowebuj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614359ada1c64---55952492552.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/20954209519.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gezamudap.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/16357305893.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/37093736672.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/18014330092.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/50223099711.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/gudowon.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/pirugogubipawov.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/wejetawonovu.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_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 10908 bytes
SHA-256: d238367af5ddfdc57b19b2d356198b99f8c84df73aff4c22ef56b23b5a4d809d
font_01_sfnt_off00014f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16733 17820 bytes
SHA-256: 192aa07e093c8f3aa7688d2f5c6394d98c8702e9c5441279da6b4abd4c110286

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