Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc82ef1810b9f666…

MALICIOUS

PDF

73.7 KB Created: 2021-03-02 09:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 42d90b629ba62c1fbcf23bb6e8145716 SHA-1: 0ccbb078a5931e9060e0913b499db1b19cc1cdc8 SHA-256: cc82ef1810b9f666825376caab5717d83c60079c7260ca5b1cb8c8bad0407980
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru/award', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, further supporting a malicious intent to redirect users to potentially harmful content.

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/award?keyword=trolls+just+can%2527t+stop+the+feeling PDF link annotation
    • https://cdn.sqhk.co/vuwonesi/ihdgcZA/meme_stickers_for_wastickerapps.pdfIn PDF document text
    • https://cdn.sqhk.co/sofawaju/bPGlHPG/mega_skyblock_survival_map.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/gHfcdCT/brilliant_distinctions_provider_code.pdfIn PDF document text
    • http://wagirozi.iblogger.org/adobe_acrobat_dc_ita.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuruba/p1xpkgh/dr_davy_dentist_st_maarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_600feee87a316.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/jgi3hhl/aquarium_fish_for_sale_online_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_6030d7c56a388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_6006000bd50f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelexuxifu.epizy.com/cost_analysis_template_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/senukamafadobarabivakari.pdfIn PDF document text
    • http://maretazijedoval.epizy.com/84713927289.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/cisco_webex_room_kit_mini_ordering_guide.pdfIn PDF document text
    • http://jozeratajugik.rf.gd/lodish_biologia_celular_y_molecular_7ma_edicion.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/71947253069.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/komebotidixiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/dizunulejelenugoge.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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 5336 bytes
SHA-256: d3abc66e05c5bfd3545961b3742284bc695cbfb7cb3accb67bf92c34f6184623
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10136 bytes
SHA-256: 7eed5f044f341050f4ae513535a6a1d29fa3b1ad9dc17b14753b2b9e3b9152f3

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