Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a7936058ad441a…

MALICIOUS

PDF

85.6 KB Created: 2021-10-10 09:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f607f34e27ea9a72d8bc60fc5937c340 SHA-1: 19d65441e41ce8d2109d36ccadd9af9418f64470 SHA-256: e3a7936058ad441a0ae983227b103ab36e7283314777c9d25d4189f621830a18
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a large number of external URIs, many of which point to disposable domains and are likely used for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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=how+to+tame+a+horse+in+ark+xbox+one PDF link annotation
    • https://skatrip.com/basefile/skatripcom/files/zejazaxadojasiri.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/podibuxiterevumuledurivaf.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/xoromiwepesaromelirexev.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/30081922965.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/wufomebovenopanenof.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/rewojanewododo.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/werujejivuzuwemipifo.pdfIn PDF document text
    • http://miminku2.com/contents/files/danomumugu.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210903_72758AD38E093124.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/701f49f659f07b8a2911e8bdfeb26883/gijadoniji.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/towogoxeduw.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/gigekawabi.pdfIn PDF document text
    • http://vasudevindustries.com/userfiles/file/zewusejuxogatevokuzoja.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/91721858344.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/57742231311.pdfIn PDF document text
    • https://yuktogel.com/contents/files/sagixenivezofitiperamoni.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/11679456156.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/3097724545.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fejezixemajaz.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/vasabuxupasafofoxukuda.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/78200112640.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631388708.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/devilaka.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090402520399595429s6dnnak22i.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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10736 bytes
SHA-256: 20b8df9e1221f065f12701f091a17dfcb9b5de91ac3a00c567b77cc7e92a70fd
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 18344 bytes
SHA-256: 54e24eaa9c084dddfee8ef4c76f6f4886f811049111edba255fe508e5296c97b

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