Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef634fd20381434…

MALICIOUS

PDF

75.8 KB Created: 2021-03-26 07:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9fdc5d14a236cf99cf1f3960d41b16db SHA-1: 9b1ec9920d3453d516979beef0dfa3eaf0fbf16a SHA-256: 5ef634fd20381434661b3c0467b2f02e9174f1332ef60bc908f433bfd7aa6883
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to link farm-like structures, suggesting an SEO manipulation or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=bogota+turismo+pdf PDF link annotation
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/6612650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_60596e87e2fd4.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/reflejos_arcaicos_pediatria_2000_tomo_1.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/7bfab0275.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/kPjdYja/gasojupinimilifaved.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/hecJthc/gamecube_yellow_plastic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_602a19319bb27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_603bb2723fb90.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/ie0EWje/alien_armageddon_2019.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/nisiwanolom/bissell_proheat_12_amps_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/free_engagement_invitation_templates_for_word.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/sherlock_holmes_sinhala_books_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/autonics_tcn4s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/34662710998.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/85136875842.pdfIn PDF document text
    • http://regufowes.epizy.com/pl_sql_substr_start_position.pdfIn PDF document text
    • http://bojefej.epizy.com/42871262661.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/sovosekovorajadubonumu.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/73714560523.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 5036 bytes
SHA-256: 1f9ab171b0db8acd91b5481feb091e6be40cf179d4ae0fdaddbf5fe599adb590
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 11384 bytes
SHA-256: ac2a602009cc53640be8290903b7563602136b054cfb822286be3e4fb49f103f
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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