Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17f002ccbd7f7c0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 18:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3996e6bae0675c349cbb65deb1c88175 SHA-1: 2c5832df4b24f434afff1fd48ec7effedff8144a SHA-256: e17f002ccbd7f7c0dcf9513eae85a4ffefe5f0ad9fe089ef94df8a146c1eab1c
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 are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=how+to+unlock+iphone+to+any+network PDF link annotation
    • http://llux.vn/uploads/files/11367331762.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/22070963310.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/17517820350.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nivurolewetugugulirazuju.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/baroraxojuloj.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ripuvuzigi.pdfIn PDF document text
    • https://codecs.ro/images/file/70854954597.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/54824839162.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/rijuxokoje.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/55697151655.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6a0b9913927db50f775822cbec2a87a4/wivabodonokip.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/94634776240.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/30912247204.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xenulunebuposared.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/75516148225.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/72873888384.pdfIn PDF document text
    • http://hejia-ele.net/upload/rilugivemavezonuze.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/72771946274.pdfIn PDF document text
    • https://windscrm.net/files/file/54689676438.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/17897706269.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42812960315.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/8693940845.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_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 10688 bytes
SHA-256: f63578a07a999650f0698ecfdb50b4369597829f2fe4217b7bb607cc50e2fb79
font_01_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 18160 bytes
SHA-256: d7d3dfb30a2527cbda59ebeb99f5840386e828614589c9f375f4ca5110ce5a92

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