Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2ff7de525b4c63…

MALICIOUS

PDF

78.0 KB Created: 2021-03-01 11:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f85f6482d42523e65986ba71641b08ba SHA-1: 8f0f861b3e3149ff596e8761bffed1f3813301cb SHA-256: dd2ff7de525b4c63124b5101e87f0a7add122554b7bf948f216e51891493db2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple embedded URLs, including one pointing to 'kuzutuzo.ru' which is likely part of a phishing lure, and another to 'trycabinets.xyz' which is flagged as a link farm on disposable hosting. The document body, though heavily obfuscated, appears to contain search-related keywords, suggesting a pretext for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=how+to+connect+jbl+flip+2+speaker+to+iphone PDF link annotation
    • http://trycabinets.xyz/94217069122546bj.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/heQp6ia/klondike_solitaire_download_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/pometobab/fggiifm/super_jet_acrobat_wings_characters.pdfIn PDF document text
    • http://nadozigipak.22web.org/sovumuragajedej.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/srgfSEU/programming_language_definition_quizlet.pdfIn PDF document text
    • http://vagokij.iblogger.org/15830004929.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/fTij58P/xedizafofudamo.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/CgfEMgi/quick_home_switcher_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/je10jcs/pubixes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rebesudanolo/jitav.pdfIn PDF document text
    • http://bebokele.rf.gd/oracion_de_la_biblia_catolica_salmo_91.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/is_chrono_trigger_on_switch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/xifejejajufe.pdfIn PDF document text
    • http://rajakoxefulume.epizy.com/bobixilogiripajobo.pdfIn PDF document text
    • http://bukavomagotixe.rf.gd/46074475691.pdfIn PDF document text
    • http://guvedizimokid.rf.gd/the_ecology_of_freedom.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/notejupivujepovoregorako.pdfIn PDF document text
    • http://dimaninerif.rf.gd/python_3._6._5_64_bit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 5356 bytes
SHA-256: dfde9acfe2cd88e13b191ed5106d45d244d8953fa61e07eafaa0212bdca12e48
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10516 bytes
SHA-256: 75ddbfce988eb16ba159f0648d56f15a14878ecbadb76fe18a1c4902bc006590
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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