Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecec63f7cde79b73…

MALICIOUS

PDF

95.4 KB Created: 2021-05-17 11:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd359fae439184479eb1c720ff05ee45 SHA-1: 79346c2a02954f17aa41baf6bfe224bfb7e511b4 SHA-256: ecec63f7cde79b7306822518fb377fef55bd2f46dc79d0f293dc26a46a0d048b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://midufefew.ru/strik?utm_term=estudio+biblico+catolico+para+adultos', is flagged as unknown reputation and is likely the intended destination for malicious redirection. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=estudio+biblico+catolico+para+adultos PDF link annotation
    • http://jinokonur.22web.org/cambodia_history.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/90958520347.pdfIn PDF document text
    • http://givepamodugag.22web.org/chandramukhi_songs_kuttyweb.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/trumpet_voluntary_in_d.pdfIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_c157a7966ae347dba5180c549c29d226.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_1ce92eb9f26446cc8f1c9dc91c760c16.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_e4e3cd15da504c84a0ac9c13e435cab6.pdf?index=trueIn PDF document text
    • http://gepobot.epizy.com/excel_2010_vba_protect_sheet_with_password.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_04fedf7df69e40d9a3c4d026c873a12e.pdf?index=trueIn PDF document text
    • http://mirenefomex.rf.gd/who_is_the_manufacturer_of_skyworth.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_dd28b752fc3f4d3eab30645cbba362b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/hbs_730_how_to_pair.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_40775de1bd3e43adb0adb823725c5b0b.pdf?index=trueIn PDF document text
    • https://6acbaf94-bc62-4fdb-9a00-914544f0b606.filesusr.com/ugd/3ee118_9712aba9d8c749d59bd74d532c2e7b13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/63921014046.pdfIn PDF document text
    • http://fujebaxe.epizy.com/11804041404.pdfIn PDF document text
    • http://ranojulugonisa.rf.gd/agustin_fernandez_mallo.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/google_sheet_countif_date_range.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_2e24a5a2a8ff40019be2fe1bf1c86d4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vazisi/sea_fishing_rigs_ebay.pdfIn PDF document text
    • http://monimupanib.epizy.com/hunger_games_book_4.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_120a36245a9a4c3b8cc4d51fbccd2c82.pdf?index=trueIn PDF document text
    • http://xaxodizanuro.epizy.com/zofivetebuxiguvasupovirug.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 2428 bytes
SHA-256: 5e198e3ae6ce45da6858dd5971a751abe4d6d8a278187cd964a94e07285cdc16
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 4820 bytes
SHA-256: 94365c4aba2d0b58eb345dbef8bb132143374a45f17bdfd9ed9f34fecf097380
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 8976 bytes
SHA-256: 5f07b96a345167f8d597a4b3e1fe0e52dd7a62508af6f8e7b00de7561a89dfc4
font_03_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 13320 bytes
SHA-256: 0b06b293d25e7ae9b62336924f032e0fc9799adc84fc13bfc06d696b275ce0eb
font_04_sfnt_off00015f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F87 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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