Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa64fdde1f3c8d5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f795df580b797dbfd2f24a6d6705fd0 SHA-1: d39695029dbbf04a0529eb549c3100bce88827de SHA-256: aaa64fdde1f3c8d5c3b591ce3f47cccc0e23e15365625b87a480193e10dc7fea
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to evade gateway security. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://nomylo.ru/uplcv?utm_term=hackear+wifi+contrase%C3%B1a+cambiada+android PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161416012112c4---sereroduba.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/36344666288.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/30621436016.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/nakudotanegezepoxuruwo.pdfIn PDF document text
    • http://glassick.com/userfiles/file/59320797430.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/gazaxalovatavinuril.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/10255211442.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/65786081101.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/40052999153.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/49936020172.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/55767297.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/buvafuwo.pdfIn PDF document text
    • http://gestioniarmatoriali.it/61465230103.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/67938691828.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/64812331187.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/31548806218.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/xurogimuritofuwiponevir.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/loa85dgmibv0fqejfe7drhueca/losezumemeso.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/87382781018.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/11923953171.pdfIn PDF document text
    • https://2winit.com/Files/files/13809491832.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zisukibobako.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 11104 bytes
SHA-256: eb19041107944f3fdc1a35358572b0ac5104f37f914b0a6a7189bc0b1f0eefd0
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 17492 bytes
SHA-256: 0e2a67c7443350ae5fb12e9f8842457e289d6095d5fc563181a23ad748f0f127
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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