Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99866a420a5fa46…

MALICIOUS

PDF

81.1 KB Created: 2021-04-20 07:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 15fab89230fb6ea9145cf8280a955d99 SHA-1: d8e7780eef193ead601526992fe2961cfc709e81 SHA-256: a99866a420a5fa46efa29c4acf16aea82b3aa63a44011aedf9d530bba4eca7a5
116 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malformed exploit stream and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to geometric formulas, directing the user to the URL https://ponafet.ru/strik. This URL is likely intended to host a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ponafet.ru/strik?utm_term=formulas+para+obtener+el+volumen+de+los+cuerpos+geometricos PDF link annotation
    • https://cdn.sqhk.co/vemudumuxixu/aiehfco/tibevapazo.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/AsQjiMg/segutiwiked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_60243c3854716.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/jdgfhir/41305637855.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/cggbTjd/zombie_shooter_vr_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/gdpgdlu/voxipuwajadisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_600e1846ca2e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_604920c04319e.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/gfAhjSU/buzzer_beater_nba_live_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/Kja9Tje/free_block_puzzle_games_for_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6041514daa3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_600aa9c2cc377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d986a9-2537-4bef-87dc-0672ed67e79d/64909377392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17670b15-963d-4863-a3e6-1f0a0299dddf/how_much_does_home_depot_charge_to_install_a_tankless_water_heater.pdfIn PDF document text
    • http://feneluveje.epizy.com/valotipelavedaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a46d209-e78d-429d-957b-00647cfbb81e/63628044784.pdfIn PDF document text
    • http://mevonaku.rf.gd/1276869533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19991fc1-59e7-4974-b579-74e49e2d2f5a/percy_jackson_sea_of_monsters_luke_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f921e34b-446d-4fc7-acee-6c721109f5e9/55704154322.pdfIn PDF document text
    • http://winovonisalupib.rf.gd/xadibatirawosevonozowiwof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad1f060-7a80-4655-aa2e-f58e57971f3b/96126238039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975bf284-a640-4474-a985-fe419eff387d/pinesutuk.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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 5548 bytes
SHA-256: b8b3acab48adcfa800dfc134102e97f8a5fd8cefec23708d4394e5d53a7581f3
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 12672 bytes
SHA-256: f4a5eb4afdf9702b50914205af5ca2390f84f8a8a416281c0cd00b065577dabf

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