Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1695c34af5c2c43…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 17:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78fa5947e4b517669fae0cf07d61836d SHA-1: 3d16d3735026601d66faff05f3fcec1a049aa2ae SHA-256: f1695c34af5c2c437fd3b5414df9718f0369531d866192982a4d7aeb7bf978a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. The presence of these links suggests the PDF's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dgelc.com/userfiles/file/20210903043814.pdf In PDF document text
    • http://sanmorales.es/userfiles/files/56267901982.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/62869242353.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a95bb632---81341900521.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5ca96c78---zetulimabaripiko.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/6404819006.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/12010555569.pdfIn PDF document text
    • https://hse.tw/upload/file/7122986504.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xowewoguk.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/jonuru.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/53197425029.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/potamubamotigede.pdfIn PDF document text
    • http://wwsm-us.com/files/file/10742418911.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/futepeximo.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/21925120902.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090400120773499.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/98374448594.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nabiwinotu.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/28967746325.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/93811214027.pdfIn PDF document text
    • http://byecook.com/ckupload/files/zopopobazijexawe.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/17972322072.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/94108637436.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/789235489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=transformers+dark+of+the+moon+android+apkPDF 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_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 15668 bytes
SHA-256: 1bb3956721825d78647904282d41f87e30593a7bf2f3fdd0016e05be7bf040d7
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10772 bytes
SHA-256: 435114786450e2a5f5b2c59298cd7ca0d628c4fb78491e4e55258cee6142c4d5