Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0d5afa8ed1170b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 22:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 15f9605110347b201ad0b65733610ac7 SHA-1: 3f5cbab2ee94fc60f3038b3edc16fa3c958002de SHA-256: eb0d5afa8ed1170bc5a730dbf9555466434d38797c2d9f4aefcd75eed33a57d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of a link farm with numerous PDFs hosted on various domains, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sbs-group.co/userfiles/files/46745910389.pdf In PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/zokibitarug.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/96411811571.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab0d2d7a2---sizomibuganugot.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/pudepojamatote.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/62674557305.pdfIn PDF document text
    • http://biosite.ru/images/news/file/68577835059.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/sotodinabi.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/kagulapuvofejinisalarev.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/6134651330.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/69787794600.pdfIn PDF document text
    • http://123dvere.sk/files/file/18269242242.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca5b2b915---24012981607.pdfIn PDF document text
    • https://ksboutlet.com/file/files/31244231435.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xizibavuxejixe.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/mazivudumazuteramepatake.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/jumugegufifow.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nuxezewikumejadijavir.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/78341548822.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/74683095471.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zokabojuniranofiziwogukun.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/jesuriped.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/10383897165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=inshot+unlocked+apkPDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 17168 bytes
SHA-256: 53de6665cbc0e7696cf1708b6d5f93910c48ae13a7fe21239173ed77d4951eb0
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10564 bytes
SHA-256: 5d54f118f01f79e7d020cbadb34047ac67a3d0dab8de18fcf27a1a240af4fc5b