Malicious PDF — malware analysis report

Static analysis result for SHA-256 243e3311168754a4…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 01:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00f9a686b3530e39014d309f09be4c4d SHA-1: 20b5f5726004e958ad9a15e84631bb7a5ea900e3 SHA-256: 243e3311168754a4e1ff0c1936676c4bbcd3db1fe8bd5f70d45466031883bd68
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting an attempt to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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
  • 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://limadelimon.com/images/file/bowenodadisofaxege.pdf In PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/47410883778.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xolutuxure.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134256e056b3---49043565659.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/wiburodumiwabujivipiwek.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vikofugebufinozasoz.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/8807118232.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/58913551730.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/4919856362.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/10280452487.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/devumerobipimera.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/xejigizudiritirog.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/desofalosezan.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/10961440142.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/gizijuvixopojenemukak.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/lebog.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210916044852.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/kapurijalelidubif.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/detawotutamolojijal.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jedolazon.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/31093947191.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3439d46f1d2da77a4c63f91c94c4acc7/12113656171.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/dilibodirupoju.pdfIn PDF document text
    • https://membermimpi.com/contents/files/97971889813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cod+waw+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_off0000af4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 15072 bytes
SHA-256: 616e6d29f13523330d50ce6cd862dd3fe7ebae686f8f1e61fb359561e8ae2dcb
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 9916 bytes
SHA-256: d66c1573fa313bd7587cafbaf362bf7a55689b9a79bc2addbcc38c2c8d272b5a