Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc1798318d3506f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 11:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19c2c63b1314889a4a681c28cfc71c5b SHA-1: 409979746ee66cf085a01cf9cb94890c4006d664 SHA-256: 9dc1798318d3506fcc1a79647cfee228d5212d1fd3040a17c8517f84a78e19b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the presence of many unknown URLs points to a potential redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://nenkin-t.com/upload_img/ck/files/xenog.pdf In PDF document text
    • http://1carl.com/userfiles/file/63791412948.pdfIn PDF document text
    • http://kleiberit.ru/files/file/62629702988.pdfIn PDF document text
    • http://hodori247.com/uploads/files/20055771431.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/19821877030.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/rivirokukoje.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/54278332417.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/30629667545.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/doves.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/momonomisomixale.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/wugugidak.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75a862f70---10437316739.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132465ec596a---51892962833.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/40645385436.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/mogitogomejuvijaropil.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dosivunidodofoborudedew.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/85237337127.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nidapuwalere.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/90348439206.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/likinitakukuwon.pdfIn PDF document text
    • https://eguiders.com/uploads/93959274468.pdfIn PDF document text
    • https://deepex.hu/hirek/files/31247904496.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/pafogetisifulatejatifi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/16051880236.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/2173643886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=live+cricket+tv+for+freePDF 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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 9964 bytes
SHA-256: f1cb697f4f52fa402ba32495618b534f3da41f59c61052f83ab9f3b77dca92f1
font_02_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 18284 bytes
SHA-256: 6409fc2bf05795142a1eae95819e3013a8f3f370466f62e4f1aeabb0c544702c

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