Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32caa6f64a11c8…

MALICIOUS

PDF

81.8 KB Created: 2021-05-11 06:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 37ddfeb6833f456c36d17ad33137adb0 SHA-1: d53e2fe2b9bdb1a639fedb4c4b9a2b1b5b8a80d3 SHA-256: ac32caa6f64a11c81c0843487bfb2cab8979f03907848b07cb5988332b553e0c
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution domain. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content, fitting the pattern of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=7.3+powerstroke+manual+transmission+conversion PDF link annotation
    • http://7lessons.fun/nizewifonarazimegogefi7re8e.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/jedakuzovewid.pdfIn PDF document text
    • http://elinekici.online/periodic_trends_worksheet_atomic_radius_answersn2ozu.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/1344008454.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/21493700517.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/lutip.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/razavegoda.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/sutiduloni.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/55768338518.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/78989798632.pdfIn PDF document text
    • http://prequester.online/1799365366zljih.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_8b6673d838754b4d89a9ab1133c05376.pdf?index=trueIn PDF document text
    • http://puribisipup.atwebpages.com/alexa_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/simulacro_de_evacuacion_2019_costa_rica.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/4426705125.pdfIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_1356f66263924806b16e2d95bfbfaa49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/kupat.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/aila_re_video_song_malaal.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/how_to_use_range_extender_tp_link.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_463aa0c8d1674905a0d790e1b8db2233.pdf?index=trueIn PDF document text
    • http://wuragumok.atwebpages.com/revista_natura_ciclo_14a_2020_argentina.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_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 5476 bytes
SHA-256: 8f8c868851e8525fe33ef54b65b01f5f649b105ef0a2e93cfa44aa4444be1f75
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 10888 bytes
SHA-256: d553a83280fbb0c572f5e7827ab3717afff612c4b34f40ca56725eae8019685d

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