Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be18c1333cc5025…

MALICIOUS

PDF

78.1 KB Created: 2021-09-25 16:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a767a993029e46211feea5700e34f22a SHA-1: 869e2bd7231610107d4e53948a63e2d4df9bc52a SHA-256: 8be18c1333cc502590983cde63062841e97c76ac950110726bbe707add5d1da1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. Heuristics indicate this is a link farm designed to host malicious content, and ClamAV detection confirms it is a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=genymotion+google+services
    • https://slide-bearing.com/d/files/4016499538.pdf
    • http://szguilong.com/userfiles/files/6587204717.pdf
    • http://consulcongress.it/uploads/assets/file/96513321377.pdf
    • https://hazeloyun.com/calisma2/files/uploads/bemidid.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/zasuv.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad66709b9c---xipikilabi.pdf
    • https://griby.biz/ckfinder/userfiles/files/linedefugipeboxujenuto.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/tumotagifixawezipokuso.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96873013268.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/romemajoripigevuzusemefo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25298fb49---46693346509.pdf
    • http://garagehayashi.com/js/upload/files/82771821770.pdf
    • http://inphilong.com/upload/files/89776166002.pdf
    • http://sportsclinicwest.ie/media/contents/file/giworobamejaludeved.pdf
    • https://dom4m.de/userfiles/files/24116841181.pdf
    • http://sameiroeventos.pt/ficheiros/37111802968.pdf
    • https://5ky13lu3-1251.com/contents/files/xojusazoled.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32498559280.pdf
    • http://pijntherapie.be/uploads/files/69670806716.pdf
    • http://ambvetfanini.eu/userfiles/files/vosadejubupilorawima.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/11924849858.pdf
    • http://tanriovermensucat.com/uploads/genel/files/86927090562.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/577760388.pdf
    • http://boekenwinkelindex.nl/images/uploads/xesugonolofabavof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4c2.bin
e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 16232 bytes
font_01_sfnt_off0000caa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 16792 bytes
font_02_sfnt_off0000e2bc.bin
64861ffa9f42994e7fd1ccb68c267f01728ca3d8d166f4162911fade08aa7126		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 10632 bytes
font_03_sfnt_off0000fb18.bin
21d5f7f0c24d102ac696c38b82f935687b64cfe989b954996fa312b36d086591		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 18812 bytes

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