Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf883cd96a60d58d…

MALICIOUS

PDF

73.2 KB Created: 2021-04-11 00:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 233526f1ae4644feb465018100cff1a3 SHA-1: 243565308e1ee0608dc643c5df25246ae4cbe496 SHA-256: cf883cd96a60d58d369d12b08bd0b3e3d469da9de3d4bece53f90efebdec38ac
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains or redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to academic materials, likely serving as a lure to encourage users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=engineering+mechanics+dynamics+meriam+and+kraige+pdf PDF link annotation
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/915534.pdfIn PDF document text
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/sedazoteko.pdfIn PDF document text
    • http://prazdnikprosto.ru/molar_volume_of_hydrogen_pre_lab_answerso54ij.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/96759988975.pdfIn PDF document text
    • http://topsalon.xyz/84350138620x4qqi.pdfIn PDF document text
    • http://italylife.pro/zunudapepupofezawlfv1k.pdfIn PDF document text
    • http://vashobereg.com/kopoz54311.pdfIn PDF document text
    • https://mizovitima.weebly.com/uploads/1/3/4/2/134266674/705266.pdfIn PDF document text
    • http://zudalipa.22web.org/lenanisuriz.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/65164321302.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/panajemapivijag.pdfIn PDF document text
    • http://cashbackmoney.info/denujea4jj5.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/e5ba43f68646.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/6331672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/system_dynamics_for_engineering_students_solution_manual.pdfIn PDF document text
    • http://zobotidagulipu.epizy.com/terenukawiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/43872840192.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/ti-nspire_cx_ii_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/wesosumagudifowerav.pdfIn PDF document text
    • http://giduxugidisan.epizy.com/sejarah_perkembangan_pendidikan_islam_di_indonesia.pdfIn PDF document text
    • http://zosowafux.epizy.com/et_arcaica.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 6524 bytes
SHA-256: 49ed13f32e999db3f9416fe1b3bf839655f2603a14a8b246d3987b623877a3e9
font_01_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 5660 bytes
SHA-256: caab7a819f67289fa888134b02d142848d7f3b0e875a0e860c1c5e3b7fad1b31
font_02_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10168 bytes
SHA-256: e0df6c00a8fedea9c32f0b97659e73b4e9fc28cc3094f03c691e4bf5df8ea984

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