Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbd1722c7852060…

MALICIOUS

PDF

73.8 KB Created: 2021-03-30 14:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7593e6f56d66ba27e683b6e4b91dc934 SHA-1: d01a6c1c04ca14aebb09063cd0c106e72d52478b SHA-256: ecbd1722c78520605fcd1e49064da4aa405bcdd82ea53bd7edb2f769d71f1e4d
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://crophysi.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=can+i+make+a+strawberry+smoothie+with+milk In PDF document text
    • http://megatorg.ru/37288887986h52u5.pdfIn PDF document text
    • http://xipelosowux.22web.org/81741179701.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/7b479b2f21f8b0.pdfIn PDF document text
    • http://fortysgjdk.fun/rujiwisudumuxojexeov1hz.pdfIn PDF document text
    • http://shtangye.xyz/is_skinny_goodi7jt1.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/forewenoxasoxobu.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/bosquejos_biblicos_evangelisticos.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/cirrosis_hepatica_alcoholica_nutricional.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/58002430694.pdfIn PDF document text
    • http://yognat.space/aristotle_on_rhetorickbb9z.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/31906963987.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/complication_appendicite.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/a991dce0.pdfIn PDF document text
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/notaxegevukatal_jonulajewin_dizarikigozip_fuxilanun.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
    • http://tudutov.rf.gd/nigerian_customary_law.pdfIn PDF document text
    • http://dodudizoga.epizy.com/test_kit_boraks.pdfIn PDF document text
    • http://ditajizuru.rf.gd/gojitofokepefebanudez.pdfIn PDF document text
    • http://gusojabij.epizy.com/sql_data_analysis_tutorial.pdfIn PDF document text
    • http://bewaxupu.rf.gd/neoclassicism_vs_romanticism.pdfIn PDF document text
    • http://zewixezix.epizy.com/practice_8-_4_rational_expressions_answers.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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 5136 bytes
SHA-256: 9348dfa8503c253c5aede2a7304a6f41f88951e6caba298a72c4a437f08f9bd5
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 10264 bytes
SHA-256: c98f74ae5d81eddbff9c16158cd225e7fc2bce9036e43daa646eb96173018342
font_02_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3