Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fe9ac644863416…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 13:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cc4e926eb0e61389782d6ede1b1a99da SHA-1: 4d965f5479e2f35a33ad829395a15c26956c8822 SHA-256: d2fe9ac6448634167577a618a80d065f9a29d21d60600f6fc06a985c8eada1e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://coretry.ru/uplcv?utm_term=protocols+used+in+osi+model PDF link annotation
    • http://csc0516.com/userfiles/file/20210910113428_x03y18.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/nilinajozegaz.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kefoxeporelibupemi.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/rubikevotodadaruzojomuras.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/tubomo.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/jinokefi.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/50930994063.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/jejasukovofujelajefekebi.pdfIn PDF document text
    • https://bfull.ru/uploads/files/48585898227.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/doroxiw.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88686108683.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/tibamexurimesuvupafidopa.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/lufemedonulilumemotejaxuw.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/31077515736.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/10296667331.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/15115905878.pdfIn PDF document text
    • https://zhansq.cn/upload/file/pofadopake.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3ea131f6---delipodozutevofamavagit.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021090408271441026.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/pudegiru.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/jovotisenokiviposab.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905200722.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/95858604863.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/foturiziwifinosudezanito.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/26581682145.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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 10468 bytes
SHA-256: 97f7175c5ddd10cdb18de5e58ff3995b0eaaaecbdcbcf121cff10fffc1849414
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16644 bytes
SHA-256: e3c0e444bca95a38b69eb4428b3712f2771ea561dcf21855b39d6f3ef325ab99
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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