Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe0f0011b401911…

MALICIOUS

PDF

74.4 KB Created: 2021-03-23 07:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648a49d0a5f77d53672398693fde7de6 SHA-1: e3dcd54510c5ade833076155eecaeb1cfeec78d4 SHA-256: cfe0f0011b4019110259adad7e677a9dc0137d8bdc21788eac5cd1b669cda692
156 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, with heuristics indicating it's a PDF containing a large number of external links, characteristic of SEO spam or a link farm. While no explicit script was extracted, the PDF structure and external links suggest an attempt to redirect users to potentially malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=toefl+exam+pattern+and+syllabus+pdf
    • http://sdek-24.cc/a_way_of_being_carl_rogers_1980n9rkd.pdf
    • http://gojoges.iblogger.org/recursos_audiovisuales_en_el_aula.pdf
    • https://tukojokub.weebly.com/uploads/1/3/4/5/134513360/7577978.pdf
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/noxororoloforodole.pdf
    • http://lnstagram-verificationbadgeform.com/free_online_zombie_defense_games3hs0m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/967c4408-a492-484e-a2a1-e512c757f7c7/29137541238.pdf
    • https://uploads.strikinglycdn.com/files/4ad25343-036a-43f1-a556-c472a45ec5ad/the_dip_seth_godin_free_ebook.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_0ea326c2ed6b4bb3993101a3e30df0b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a248fe54-5a5e-42ac-baec-3175be0d75c8/samsung_55_inch_television_dimensions.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_811bd977e91340059e472c45ff342c1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/148eecd0-609e-4504-bc19-1b6ecf670f31/macbeth_act_4_scene_1_study_guide_answers.pdf
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_09b7197f19f047b7a85a234d488b8c71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12ac2480-e59a-4ad3-8c36-49d1fef427f9/the_tempest_summary_act_4_and_5.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_e6f4b656585b4d03ae185d0251895568.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f865d540-1132-4e6b-8a1f-7d8c069d18fc/dituxatikexirug.pdf
    • http://nulepavujuzafo.epizy.com/low_carbon_steel_grades.pdf
    • https://uploads.strikinglycdn.com/files/1f338a74-b15c-4883-8b52-dfa152bba877/ejemplo_minutas_de_trabajo.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_off0000e62b.bin
85738629d5553ac53ffeb57fbfbe7ad51a3a40b3b715061365aebd009abeac0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5444 bytes
font_01_sfnt_off0000f8a2.bin
ce494554911b64b8c05f783044e18e96eb6892cda53ed412a892c7a1ebf23753		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 10560 bytes

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