Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eea98edc56ae30…

MALICIOUS

PDF

79.3 KB Created: 2021-03-26 17:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 237bf1d6ec69b6733c49cc3ae6afcc9d SHA-1: 565616b39a17b5fbeb5299172d2e190b85a1c679 SHA-256: a5eea98edc56ae30691adb515b299acf18c1235fb9811318e5b8aab665f22878
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 numerous external URIs, including one pointing to 'resalured.ru', suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, which does not provide further insight into its specific malicious function beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://resalured.ru/award?keyword=assembler+system+programming+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423452/normal_6044c96aa5360.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/iCidyAU/43397077282.pdfIn PDF document text
    • http://circus.market/el_dia_que_la_tierra_se_detuvo_pelica0s0d.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/339192.pdfIn PDF document text
    • http://wumijodurixemi.22web.org/vosuwusazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_602f4882a233d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_5fdc88e695648.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/aKiciik/karate_king_fighting_games_super_kung_fu_fight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_604319785457c.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/nyhb5jb/sodium_phosphate_monobasic_safety_data_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fe10dd91352c.pdfIn PDF document text
    • http://lutusogugifuj.iblogger.org/paziforetamijele.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/hapjhii/19520896363.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/tutepemexufutawif.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/administrao_oramentria_financeira_e_oramento_pblico_para_concursos.pdfIn PDF document text
    • https://zenisitidijo.weebly.com/uploads/1/3/4/3/134309999/wilazajedurazezopa.pdfIn PDF document text
    • http://logoped-samara.ru/bhavesh_joshi_full_movie_freed6h8m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d37fcb-3cce-4753-80ac-98f84cc7e78d/5090338692.pdfIn PDF document text
    • http://sotatelovutegep.epizy.com/98753721414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc2167f-c484-4037-bc58-b27ab4c3e141/how_to_write_a_thesis_statement_for_a_critical_analysis_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60c4509-e340-4a22-aaef-73caadc76114/carry-on_size_for_jetblue_airlines.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_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 5592 bytes
SHA-256: ac675b55db26dc2f8b6dd4c09328885d4db1aefafb2c6ffad913fb6538526a0d
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 11516 bytes
SHA-256: 24952f80e4540f86d3ea44e9571bd3da3201a79a4ef8836401b5ad9e211372d3

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