Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c37a2de6496123…

MALICIOUS

PDF

75.4 KB Created: 2021-04-26 11:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 00fc6373ad15a332dd959d7cbc5ebe68 SHA-1: e2bea87ec79077b94e7f12f6593e8723691597ce SHA-256: 55c37a2de64961230ed4a27f2cebaccbd0c28bc49fdf116ac53d307ca2042e4d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain metadata related to project titles, suggesting a lure.

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://dafemum.ru/strik?utm_term=basic+electrical+and+electronics+engineering+mini+projects In PDF document text
    • http://zawopim.mygamesonline.org/evaluacin_del_aprendizaje_significativo_en_el_aula.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/3ds_max_tutorial_download.pdfIn PDF document text
    • http://ejqy.com/server_maintenance_reportdzxxu.pdfIn PDF document text
    • http://spindlndou.space/murarozikiwegenalwa52a.pdfIn PDF document text
    • http://djami.ru/3054137681j1gy5.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/rumeketon.pdfIn PDF document text
    • http://zoxulojiliboro.22web.org/lotafijofolopa.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/what_is_the_meaning_of_non_violence.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/sulilatuviwanutijeva.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/52642104971.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/70620120861.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/24716318093.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxejusoselota.myartsonline.com/98204582074.pdfIn PDF document text
    • http://nalobilemuzun.epizy.com/easy_friendship_bracelets.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/4339308498.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_b5e520bdc479495fa1d5f79add8b25d6.pdf?index=trueIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_55f0d2083ed64ab0b750bf18396589d4.pdf?index=trueIn PDF document text
    • http://xetawirozam.epizy.com/how_to_add_bleed_guides_in_indesign.pdfIn PDF document text
    • http://mutomipana.rf.gd/22142962581.pdfIn PDF document text
    • http://midelex.epizy.com/printable_kwl_chart_template.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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 5520 bytes
SHA-256: 61894e16244c4f9d86b752f58acdeb74a8e4ef76fea8a366cd301a855eef0dce
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10656 bytes
SHA-256: 7fa605148e1be58c8ee477d49b85eef7064dddee3d9c0cfcbe21e8bfc1648f90

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