Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d0e8bd3f16487c…

MALICIOUS

PDF

74.7 KB Created: 2021-04-18 12:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d1b997f2df52be66f42ba916b960cf44 SHA-1: cac17b9d06bad7dff9df9125b62d7f191282e1d1 SHA-256: 17d0e8bd3f16487cedc1e0b926e268427274f27f8dae23c6aa7345ee745dbb8c
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'seumenha.ru', which is flagged as a suspicious URL. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests that the PDF is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=les+miserables+original+cast+one+day+more PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464314/normal_602f1a23320e1.pdfIn PDF document text
    • http://xinufajororedud.iblogger.org/jamonugigo.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/94216394327.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/alto_sax_sheet_music_for_beginners.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/antibiotics_guidelines.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/descriptive_statistics_types.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/42837182574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_60612c8e661e3.pdfIn PDF document text
    • http://pomuropujuj.22web.org/kewozasosidekavutizuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peledopa.myartsonline.com/64755995490.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/ankusham_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/webixuzoregunepoluwe.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/kugebogip.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/98807954529.pdfIn PDF document text
    • http://bakalawakajade.epizy.com/xizelejogelomuserob.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/sodabeforewutuxexi.pdfIn PDF document text
    • http://numowun.rf.gd/pathogenicity_of_salmonella.pdfIn PDF document text
    • http://sajavisazoz.epizy.com/ruwajuworan.pdfIn PDF document text
    • http://rorugaroli.rf.gd/25220833765.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 5444 bytes
SHA-256: 4d0f43e8a60680321b9a435e5db07351af0e577557678fb6c0356cc7f35f212e
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 12572 bytes
SHA-256: 3b48fede8b01271f69d20479116199243b715d2dbf1105f3578ac872f5ddc494

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