Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0b11447f26e35b…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 16:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2542b82166d7d929dd33c3d7be400c61 SHA-1: 2143de7b4cd00fd97cfb08d6da5d71cf883fca11 SHA-256: 3a0b11447f26e35bb2e8e0cd1ee6be850247e60dd773f094f006dc9165779b9a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL suggests a phishing or malware distribution attempt, disguised as a search result for a popular book. While no scripts were explicitly extracted, the PDF structure and external URI heuristic point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=head+first+pmp+latest+edition+2019+free+download+pdf
    • http://trokot-online.xyz/rejesudelawerigitolk3is4.pdf
    • http://givupuxorow.iblogger.org/28609227579.pdf
    • http://wumalazari.22web.org/chikes_school_days_quotes.pdf
    • https://cdn.sqhk.co/wadupaxi/jhhwicU/vosilove.pdf
    • http://gonzo-3d.com/international_journal_of_research_in_pharmaceutical_sciences_and_technologygw0oi.pdf
    • http://3203epworthcres.com/kafibs58d0.pdf
    • https://cdn.sqhk.co/jotenitix/ageuvjb/ferivojuwoxaden.pdf
    • https://cdn.sqhk.co/zafazegig/o9Lemgv/ielts_listening_with_transcript_and_answers.pdf
    • https://cdn.sqhk.co/fikalibumi/aibgjhh/low_level_barrows_guide_osrs_2017.pdf
    • http://amorexpo.com/tevivamixlmb5e.pdf
    • http://bubuwir.22web.org/acute_pulmonary_edema_nejm.pdf
    • https://cdn.sqhk.co/zulatobi/eImfijj/nezemoropudiwabugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/venunamazozuzo/18491326839.pdf
    • http://surifuj.rf.gd/nidinelofa.pdf
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_13b469807ee24ff4bb40446a88e5e87e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cf8a91b-3d15-4ef5-9601-03287ea517c9/nolagipunegemejefajanulen.pdf
    • https://uploads.strikinglycdn.com/files/603ba967-41fc-4d54-9601-df95cfa815f0/65455830971.pdf
    • https://s3.amazonaws.com/gusule/what_is_forensic_testimony_law.pdf
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_0ec7555caa774efb82e162dd23370bff.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_688f5368becb42bd94f83f5d4e531f70.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f603f7fd-552a-4e2e-8830-80a886f5f424/24523873637.pdf
    • https://s3.amazonaws.com/degisapemifa/bergen_performing_arts_center_hours.pdf
    • http://gujomodezeroj.epizy.com/8909370162.pdf
    • https://uploads.strikinglycdn.com/files/ef0efb2a-1d50-4c33-b271-3f8a25dd9474/what_is_nursing_philosophy_definition.pdf
    • https://s3.amazonaws.com/rebesudanolo/77680300155.pdf
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_a6fb576095e44ca1819baa1fd7f0da27.pdf?index=true
    • https://s3.amazonaws.com/ladojenefe/38315448255.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d6.bin
9c3d14a5105a0f0fce75a5909aa6ed0751793f21e5bd69a8112fb590a1218811		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 5720 bytes
font_01_sfnt_off00010c52.bin
ed880efafe1060fb57c8c0177006f3255077acdfa69a9c7811f8a15d4ae4605b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 14076 bytes

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