Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abc3b13d0180ddd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 08:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8da47486ead749bb7603c060db2cd5c5 SHA-1: a72efdb4fd8f809a46c391b3dfd1258c783bd537 SHA-256: 2abc3b13d0180ddd601d223b2669e180d1cc2c9935ca155b108a7eb22f2d227d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable PDF hosting sites, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://euroteam.vn/ckfinder/userfiles/files/65056167923.pdf In PDF document text
    • http://446888.top/userfiles/file/gexiwuvarobeg.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/wekomejivezod.pdfIn PDF document text
    • http://jiab.net/userData/board/file/80965728494.pdfIn PDF document text
    • http://packturf.fr/files/48641406781.pdfIn PDF document text
    • http://bresky.cz/res/file/32699550129.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/redirokiwazikazev.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/70793319983.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/vitinigeponitipez.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/xazatumapezeteti.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/55983314171.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/71292173351.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/62830845047.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615141f9e4304---8559706555.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/53741683068.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/39024927841.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/gusonilik.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/70595272705.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/92934538649.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9a05c657---zevikog.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/585566706.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/migipizivurinojefo.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/fabojididujoramutatale.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/80245426770.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16315932436870.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipukinimupurikavuxozox.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/pibumonofalis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hack+vegas+crime+simulatorPDF 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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 10908 bytes
SHA-256: 09afc2435b7a78af8a4ed676cb5463dc249255257aaa8954972eaf053de3b800
font_01_sfnt_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 14680 bytes
SHA-256: 20e8f13d6e328b8f0dcdc065bd14c870326275bc6913e987866692dd126195fe
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1