Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c59e539743f0bb…

MALICIOUS

PDF

78.2 KB Created: 2021-03-01 19:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec63efef75890f0a5e917010197d2e28 SHA-1: 4d7456c18a1e3d5c4fd8d6e4e957b693b8e5467e SHA-256: 89c59e539743f0bbdcaa23a4f9c6b80ad62ab1e407b716a2b3ab169b5dc66356
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external websites. The embedded URL 'https://midufefew.ru/wix?keyword=thank+you+letter+for+guest+speaker+invitation' suggests a phishing or scam attempt disguised as a legitimate document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead the user to a phishing site or download further malware.

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 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/wix?keyword=thank+you+letter+for+guest+speaker+invitation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393759/normal_602932dbe3fce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5ffbe6e510982.pdfIn PDF document text
    • http://dkblogin-de.com/45275352720o8vw.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/71039969797.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/bokulodisenuxarokexiwik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fdd2859023cd.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/jesewejatogovajeno.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/23787282977.pdfIn PDF document text
    • http://ovca.space/spreadsheet_compare_2_columnsctf0t.pdfIn PDF document text
    • http://all-host.site/sutowudowulafvawel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373504/normal_5feccd96a36f9.pdfIn PDF document text
    • http://gladkoe-telo.xyz/ba_pass_2_movie_coolmoviezfgjwg.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/giwawuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivimufe.atwebpages.com/17191704516.pdfIn PDF document text
    • http://liboditi.rf.gd/endnote_apa_template.pdfIn PDF document text
    • http://rigemileluzed.epizy.com/bodoni_mt_font_free.pdfIn PDF document text
    • http://metukobitoro.rf.gd/nabipeg.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/gomikemufuwusi.pdfIn PDF document text
    • http://dowewuzosibu.epizy.com/90550636353.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_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 5336 bytes
SHA-256: 6667253524ae58d5f0bf84ee382f9526a9634d9cc0a7db8560189c1dcef04d1e
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 9712 bytes
SHA-256: 5fe5a1f098e48825e1cd1d6ba69d0dce419bc4ef45bbf94c69e1d01fb29f86d7

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