Malicious PDF — malware analysis report

Static analysis result for SHA-256 620387327ffd102a…

MALICIOUS

PDF

86.1 KB Created: 2021-04-01 22:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e00ebba0c665f9173f25379292b96639 SHA-1: 4c891de71db192424b12e4a096de93d8f900801d SHA-256: 620387327ffd102a393a5bc49868463cd96910478be8df55121cdac64836f27a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of many links on disposable hosting suggests an attempt to distribute malware or conduct phishing attacks, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://midufefew.ru/123?utm_term=bratstvo+crnog+bode%25C5%25BEa+21+pdf PDF link annotation
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/kewupefis.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/2711748.pdfIn PDF document text
    • https://piluzixalevuj.weebly.com/uploads/1/3/5/3/135345731/xasojikubogi.pdfIn PDF document text
    • https://nojezedefefowas.weebly.com/uploads/1/3/4/7/134762002/bf901a.pdfIn PDF document text
    • http://tumibejum.iblogger.org/darolipusipifexarubodama.pdfIn PDF document text
    • http://pusuwanoxanopo.22web.org/android_device_manager_android_studio_3._2.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/gajofetuzunimopavomeniga.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/how_can_alexa_control_fire_tv.pdfIn PDF document text
    • http://kulixebuvalafin.iblogger.org/njhs_induction_ceremony_program_template.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/riwuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_fd042d0e19bd4fc8a7fb7634aeeb182b.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_ad1e7af8be1142d2a805b15556887c42.pdf?index=trueIn PDF document text
    • https://66ed7271-8d0e-42db-835e-1397410840d0.filesusr.com/ugd/fe0276_955ae04b5ee343bc83e851ba178e1494.pdf?index=trueIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_6ea98c693003484191edc5d3ccf3412b.pdf?index=trueIn PDF document text
    • http://wixixikaluzisis.epizy.com/simulation_and_simulacra_the_matrix.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_12273719796f46239729b64d5e27a483.pdf?index=trueIn PDF document text
    • http://zekafoweratum.epizy.com/american_college_of_sports_medicine_guidelines_nutrition.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/relation_between_gdp_and_national_income.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_f7334126a5fe4ba1951f7e8f8f756ab8.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_83bffdb8a5d041658025b74101c6396a.pdf?index=trueIn 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_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 5804 bytes
SHA-256: 171f64348b54d537f36504077f8cb290435725aecb3db0328366929fb90361f6
font_01_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 11288 bytes
SHA-256: c59ecbf1ca4a06c1e97cd960256343e46825e338b5dec47ffc1bac12289c52a4