Malicious PDF — malware analysis report

Static analysis result for SHA-256 3804d3fab93d3d66…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 19:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ba5cfc66b2f8b2d0157e5323cef5d87 SHA-1: d2e706fe078b9e58c7d39d9483d53efd6667e6e9 SHA-256: 3804d3fab93d3d66714faaef89868db5c2d44e07e2317b97c84c24b322fd0353
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=hollywood+movie+tamil+download PDF link annotation
    • http://mobitransjogja.com/files/negiwunaxawimamid.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/11272706889.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/94124822871.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3812fa51b2d30d7a38aedf0c145dd57f/19012939753.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/31238846209.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/salozoviro.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/tisupugenokarunubuxamelor.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/38445315087.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613db76b37a5a---futudenonemumeri.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/zonadowiboni.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/9153558195.pdfIn PDF document text
    • https://masihpt2.com/contents/files/rimekew.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/firixovapirowavomi.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/duzetoxoxutifeme.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/cfd14a6b67a4281530c71e511e8c9aa8/gowejusuwapitisezafut.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/lojinezixikifexofeto.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/90034622331.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202199235524421.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8a011de0e---mekitovixaj.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fomar.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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10396 bytes
SHA-256: affbc42bbe4da9bf0a2b5fea83e2cc0360aa3f9dd677e76b74f3a4c856cc7e90
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 18268 bytes
SHA-256: bcae29077ff15ecced6c690c1db6387f87afff4c7be0850c957d656588c97b65