Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21b535b00c6276f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 06:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8127b1a2ec9997351b52374823e1cde1 SHA-1: ef6e7aa6648eae2fd17c62e4b360adcfbe555d9b SHA-256: c21b535b00c6276fec9d64418aa7fad7ab51e6c7e2dd89730a77f4eaf3278ef0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'gimoguvi.ru', suggesting it acts as a lure to a phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=altivar+31+manual+pdf+portugues PDF link annotation
    • http://wikurabafewo.iblogger.org/ielts_reading_recent_actual_tests_vol_4.pdfIn PDF document text
    • http://wuxapogetal.iblogger.org/a_court_of_thorns_and_roses_movie_script.pdfIn PDF document text
    • http://supanigavig.iblogger.org/27327535001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/domegagowevag/33697427503.pdfIn PDF document text
    • http://kepisuv.epizy.com/4630666448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc813e26-9262-478b-9490-7afeb5c0a916/63720073388.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_15f70ae13cff41cc818e79342bd5eec1.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_f6594f2abd2e4af3b59d23e7b2e58ef0.pdf?index=trueIn PDF document text
    • http://duzobujunetokuz.epizy.com/kadedajugagokejarogaf.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_4004cf4cea734884ad43b54466f3ad59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/high_school_musical_2_gabriella_script.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_128e406586a143e3b4e6ff0a57c2062c.pdf?index=trueIn PDF document text
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_223b14e4d828490b8f885ef3692ffa3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/baldi_s_basics_field_trip_mod_apk.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_c7617c56810d4627ac71bfc338d27a1e.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_efc69496286540dc995e852a3731fd4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/raruxewexopedebapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4947c343-1369-44a2-ad4f-e93f4e468808/pilulozozigogamiraxa.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/rt-n66u_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/wabusu.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_9eceea507cc34b61bf602675ece86972.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 5508 bytes
SHA-256: 57c9cbfc30d8268325ab41b0d668e88cdf9a5b66565c4f2753372e7440c00abe
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 12708 bytes
SHA-256: 9617c12979b01790e4220e8b0d80fb60d7c0638074a394f86acb03f82bc6f172
font_02_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34