Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f16310aa492333…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 09:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0925a96bf617552a2f0f8a5a8bad332 SHA-1: 4a432b9ddda752c9d455f62ae8d47d66d82b6c32 SHA-256: c3f16310aa492333db523eeb2e3f43848e1cf64496c0760916c5086f9ec1cdc0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=android+1+ldoe PDF link annotation
    • http://thienanglass.vn/upload/files/xurenojare.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/63973577373.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/57745779950.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/seripe.pdfIn PDF document text
    • http://sinostandards.net/upload/files/fudipafuvurarome.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/75828959717.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/fexugozalu.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/gixuzogek.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210912_F7BC43780DDD9D1B.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613401bd0ac98---wazizewu.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/mutigu.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/gapevinuzixuxepiwu.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/3914589552.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/xalewazilo.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/jasirezobifigox.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1632322782625782536.pdfIn PDF document text
    • http://schturman.ru/files/files/92126778242.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210915_225124.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/nazax.pdfIn PDF document text
    • http://poorclarescork.ie/images/bowijuj.pdfIn PDF document text
    • https://aneri12.cz/res/file/wesipiramur.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/21193760675.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/16110539612.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/59125322713.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109211201059028.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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 9844 bytes
SHA-256: 26a31a8a4f3e8b83757e8f697662868bce36df19110881d7838be5543f28cdb4
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 17312 bytes
SHA-256: 32cc6566a7db3d4fd765422a93475c67ba7e4c0b8d1876feb088d3b691c750d4
font_02_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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