Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddd232416d40e29…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 17:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: abd0f023272f23e723e779e3a7177a3b SHA-1: 6f0176478cb0adcf349d20584dba5b565b16f829 SHA-256: 0ddd232416d40e29d7b536652ed67453eb5414191015930f90d9abfbc3dc11c0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/123?utm_term=android+java+byte+array+to+string PDF link annotation
    • http://bewujasixi.mywebcommunity.org/tratamento_da_anemia_megaloblastica.pdfIn PDF document text
    • http://furniture21.online/video_editor_free8t1zb.pdfIn PDF document text
    • http://conicppjry.bid/3198385831d0lnt.pdfIn PDF document text
    • http://profaudit32.ru/sentence_writing_practice_worksheetshbom1.pdfIn PDF document text
    • http://cleanup-sale.site/68262038779xpac8.pdfIn PDF document text
    • http://reabook.online/19795674521ldcce.pdfIn PDF document text
    • http://tortomsk.ru/2594424064z1pkh.pdfIn PDF document text
    • http://mybiol.site/heywood_internal_combustion_engine_fundamentals_second_editionv80zt.pdfIn PDF document text
    • http://adanakebap.org/84367508702ouw0h.pdfIn PDF document text
    • http://citimart.online/employment_contract_template_uk_wordh8ubo.pdfIn PDF document text
    • http://nature-ital.space/lords_of_the_sith_mangab6qw1.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/benefits_of_autocratic_leadership.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/matchbox_book.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/cds_2_2020_maths_paper.pdfIn PDF document text
    • http://padugozerur.22web.org/canales_totalplay.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/3196792075.pdfIn PDF document text
    • http://oneitstore.pro/vovapupig02he.pdfIn PDF document text
    • http://yewes.fun/jopozufevejutapemapfd6o.pdfIn PDF document text
    • http://prodive.su/uk_study_guide8s87l.pdfIn PDF document text
    • http://ejinaya.com/dadotazarawedwl6r.pdfIn PDF document text
    • http://ponoxavar.iblogger.org/widudaxibotesaxigure.pdfIn PDF document text
    • http://selectgetc.top/contax_t2_camera_buyvklwk.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/napaxozibaneriwubudokog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://motuvogipe.onlinewebshop.net/wizobofejejaf.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5328 bytes
SHA-256: e054a85d0d29e3caa7ff9e31270a52550d55baee3253792969de5b4c4a1357b2
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 11976 bytes
SHA-256: e6afe0c880c8d389e5e7b1589c74d46567fccdcbd080531932ad3780593eabd2

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