Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf6835ed324c30a…

MALICIOUS

PDF

164.0 KB Created: 2021-03-09 19:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 20521bfd879c15969fea46f50fa85132 SHA-1: ac61e76b69a5aaf8a2018aa038d292031f04d923 SHA-256: 5bf6835ed324c30af9e78b9fb50ca5f2b418285ffebdcedae6c69ba6b3aa5faf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the presence of external URIs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=alto+trombone+slide+chart PDF link annotation
    • http://detonicro.website/warhammer_deathwatch_rpgze511.pdfIn PDF document text
    • http://nigasheff.xyz/62119789030x5ovn.pdfIn PDF document text
    • http://winsbig.space/jadojijidusufisuvewisufuamy2j.pdfIn PDF document text
    • http://mainsale.pro/dagewovisepepq3f.pdfIn PDF document text
    • http://cesaregaspari.com/sql_interview_questions_for_experienced_manual_testersy7q8o.pdfIn PDF document text
    • http://com-signto2.xyz/ejemplos_de_aposicionlvofm.pdfIn PDF document text
    • http://navaram.online/9965332294xepzl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_f984cc5e2bbe4e97b7e8957d7bc37f7d.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_af2391068edf44e088baa7a5b057daf1.pdf?index=trueIn PDF document text
    • http://goguvero.epizy.com/vezatazijasutuma.pdfIn PDF document text
    • http://belojegepi.epizy.com/91822784225.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/diruzavop.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/fimogomizon.pdfIn PDF document text
    • http://jugorufu.epizy.com/subulubobolaforomepakanum.pdfIn PDF document text
    • http://pidezesu.rf.gd/fifoxuzowolalunofubaweza.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/ae-_500_user_manual.pdfIn PDF document text
    • http://poresiz.epizy.com/32000900090.pdfIn PDF document text
    • http://bogadamarixufa.epizy.com/como_realizar_una_composicion_escrita.pdfIn PDF document text
    • http://katewamopexo.rf.gd/vudejibafaxu.pdfIn PDF document text
    • http://kolenexe.epizy.com/47146447769.pdfIn PDF document text
    • http://jibufunipibavu.rf.gd/medical_abbreviations_dictionary.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_off00023d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D1B 5308 bytes
SHA-256: b8080c959a2083223f539374411ebb80dbb8dffc4e83d2c30fb669fd00cb4cac
font_01_sfnt_off00024ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EF1 16668 bytes
SHA-256: 96fbe85113f51227dab52694fac68663d5da5212f37d585871b48007abc25ff5

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