Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a1bbe0ea7f6b21…

MALICIOUS

PDF

172.9 KB Created: 2021-04-02 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255b28f1a32daa80a446b118226179e1 SHA-1: d3a8b7627cbdb8ddef2dadb6890c97b605e73d79 SHA-256: 79a1bbe0ea7f6b212c7cad6547afb802dda5545f98517592ee53bf8225813336
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to "What is the story of hamlet all about", aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+is+the+story+of+hamlet+all+about
    • https://cdn.sqhk.co/dilizilozok/eQX94jd/gotudizupanunilalezoruvew.pdf
    • https://cdn.sqhk.co/goduwonon/hbdicjg/chrono_trigger_upgrade_version_mod_apk.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn.sqhk.co/kupemopo/cihE5jj/kotimagegunabavojomolata.pdf
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/mesax_wumopugerotamo_lasali.pdf
    • https://cdn.sqhk.co/laruxibut/hbhjJia/25765930820.pdf
    • http://nncucuucuc.space/derezaketagoxowaxakuxirzosn.pdf
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/gefafarunirisejiri.pdf
    • http://899themes-demo.ru/how_to_tone_thighs_without_gym85t7o.pdf
    • https://cdn.sqhk.co/tosilura/K309lgj/anti-_money_laundering_and_counter-_terrorist_financing_act.pdf
    • https://cdn.sqhk.co/bimowikosaru/3mhfQif/55598618840.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a0224e1-dcd9-45e1-8e32-9d14902a7e75/bangladesh_rover_scout_book.pdf
    • https://uploads.strikinglycdn.com/files/60a0584d-1c4b-4dd0-a167-f075f9f4a04e/add_2nd_edition_ravenloft.pdf
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_cd6f833d633d46278df635b6cd89bbbb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/370d2a78-090f-45c7-b7a1-1a73173f527d/what_are_the_different_types_of_tests.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_bb17150417494b51b9a270a7377077a3.pdf?index=true
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_59f90b1fb0a4400fbf1959e8d66bcd9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dcd16e8f-11de-4aac-ae7e-254ef550a3ff/soundarya_lahari_translation_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/b695b6f6-05a4-4331-b710-1d72b465a9e2/how_to_reset_kitchenaid_refrigerator_water_filter.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_off00026986.bin
e87754fc1925d0443ff693c080bbd515e57bf88f73fef41f1324c07fe19bacbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26986 5260 bytes
font_01_sfnt_off00027b52.bin
c12860556433f97d3fc21b852f871e6755c09e92e623eff7191c23f7ca0b039b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27B52 12744 bytes

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