Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe856cb74342b40…

MALICIOUS

PDF

71.3 KB Created: 2021-03-31 03:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 97e6d662a6a7cbd7ba6fe0127e5aa0f9 SHA-1: 18d497b8a05e7e5c9c7e9a182c01c5f57b3e2385 SHA-256: 6fe856cb74342b40e2e27a466b71df9db5d4bd827490a91289410701cd07ca72
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the true malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://rufamofarawaxoj.22web.org/2005_chrysler_300_repair_manual.pdf In PDF document text
    • http://natbeach.space/n600_netgear_review8tp5y.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/16348444823.pdfIn PDF document text
    • http://filfex.ru/citrix_va_access_wisconsin9y80c.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/35337329803.pdfIn PDF document text
    • http://xuledakime.iblogger.org/attitudes_in_language_learning.pdfIn PDF document text
    • http://copyrightsupporteds.com/how_to_take_driving_license_test_appointment6ngzy.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/psicologia_del_autoestima.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/fOk5VQv/66309063358.pdfIn PDF document text
    • http://italy-small.space/punid222l4.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/hga3kbm/vixurewukekofatado.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/yiijcje/bakagozanofutibixaxovud.pdfIn PDF document text
    • http://springtea.space/gixilipulelifajirdvau.pdfIn PDF document text
    • http://profyhouse.ru/drivers_license_study_guide_nj2k4rx.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/13660562183.pdfIn PDF document text
    • http://edevletorg.com/prueba_de_matematicas_octavo_basico3wov6.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/xotulevudeb.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/ehejfjf/72982089968.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/gdigOl3/eon_player_pro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Infin/~3/vjJ2dUlfWO4/infin?utm_term=advanced+language+practice+with+key+2020+pdfPDF link annotation
    • http://fijoramobizedej.epizy.com/adorn_ornaments_font_free.pdfIn PDF document text
    • http://lapabogi.rf.gd/walavitaxenudepipimudefab.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_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 5820 bytes
SHA-256: a1ffde195beb18c37784ceaea68426c7794d3261765f05e952ab0c112f8d30e6
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 15144 bytes
SHA-256: 7f7212e621bfaeb19d579e83a778bea846ff01d269048419d744616d68f747e4

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