Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f10354022850b7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 04:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53be379d255ffe43fdc6ebfd4d8f91ec SHA-1: 7fb710751a69bff6b99d51958b99e1c74d21223e SHA-256: e7f10354022850b7f998c5605fb70cd52f99614cb4e719da7f6e905a7cb28ab5
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, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via the embedded JavaScript and linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dtjxbpzx.com/filespath/files/20210901113140.pdf In PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/25534779726.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/93220866800.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/momosekit.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/mafutupolikuzir.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wexikugogavowufabubi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519f2db50e---76614803394.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/guboranakusuvevopokub.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/4925249712.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109171906115367.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/51982611449.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/welopenewoxerurejefitazaj.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/nevodufevibitulu.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zujemawuxereveto.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/tedasovazagezufisi.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/kokotisebanixebun.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/xijasufixukim.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/damowudejivulajasalo.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/49920691242.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/97859892943.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/gabas.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/woleduzidutarimoxib.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/69798066799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=send+ping+from+androidPDF link annotation
    • 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 10604 bytes
SHA-256: 6a575c1cbf0b6ba6e432dcb877a048cae0caca044efc39db69f9b91036caddd7
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 17720 bytes
SHA-256: 75c8dc9df270924009c3aa2deee6b0a22645f86d958c50200ecdd3515e55fa91
font_02_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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