Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83c830b3021fa36…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 17:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5895639b7c01429acac77795dd9d9899 SHA-1: 0664aa77803297b93d5fd52afffc0b93f4148d5b SHA-256: d83c830b3021fa364c3435181f7515e5fc44088a5d2db723b8055b8e87e89722
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=jurassic+world+employee+handbook+pdf PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387eb6e0709---36967107703.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/68466832624.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/71025537910.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/59747554867.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vuxaga.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/47158158346.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/45835466719.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/27113826673.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/fepesewosilo.pdfIn PDF document text
    • http://davcpundri.com/css/file/12728238958.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/gilafibesovivada.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/22862958367.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/sutisilelovivujituzeper.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/28734380957.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/64817349470.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/77b5fdf4ef768d52c5b523d0e078f35e/xepobesabuvumujoziwi.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/zizoximexuka.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/84612884013.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nukakikilumurewevizos.pdfIn PDF document text
    • https://mackbeks.com/files/file/95573551880.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/83891587221.pdfIn PDF document text
    • 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 11312 bytes
SHA-256: aaafd242aff43f9b7c96f257e3483d7d6b57e8cad9e2bb5f35fca7a028d9502d
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 18264 bytes
SHA-256: d80b774f7d9978065426ecf19e2f465db7e6eaa410d639a1cd259bfe4fb5a6a6
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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