Malicious PDF — malware analysis report

Static analysis result for SHA-256 435c4b086c01dd2f…

MALICIOUS

PDF

173.0 KB Created: 2021-02-28 19:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed376921d74e73c9d07a62dd5dd27ca8 SHA-1: 0932af4b1e17fa5e096b363d31742489d2c3acca SHA-256: 435c4b086c01dd2f88a50a055a2bbaf3c4dec0241ef73bdfe94bfb1e124a5970
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=best+baby+gate+for+around+christmas+tree PDF link annotation
    • http://tobolekes.iblogger.org/14085695228.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/99257494210.pdfIn PDF document text
    • http://zatizoxitosake.22web.org/nusamik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5ff52f6c02bcc.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/fU2Wjc8/39304606117.pdfIn PDF document text
    • http://znakomstva69.space/pefinowhc49.pdfIn PDF document text
    • http://helplnstagram-confirm.com/namajabuvowunhybuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5fff95e2ee94f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fd121e7d8a87.pdfIn PDF document text
    • http://carbags.site/troy_bilt_tb130_spark_plug_numberfc29w.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/17814175160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_6028fd0a53c83.pdfIn PDF document text
    • http://shoop-fl.ru/minecraft_java_edition_cheapqw5jz.pdfIn PDF document text
    • http://chuvashovfamily.ru/2808862954379onr.pdfIn PDF document text
    • http://pugalibapuf.iblogger.org/what_is_the_purpose_of_survey_report.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/tjfNPX6/zawufonosuwazodudaduso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/defujo/rafukitimuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/template_agreement_letter_between_two_parties.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/vexurilowub.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/android_version_6._0._1_name.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/ipod_touch_4th_generation_8gb_specifications.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DCD 5692 bytes
SHA-256: 07aec12daf4c262df217018b511681c1ae6423fedc580c41856841219c74b42c
font_01_sfnt_off00028114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28114 11360 bytes
SHA-256: 5ea0d30b5a069f6d0e57aeeb8e63102d99872312a4313b05ac9ee3b3a7f9b4a9