Malicious PDF — malware analysis report

Static analysis result for SHA-256 240b493879441edc…

MALICIOUS

PDF

85.9 KB Created: 2021-10-04 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ddd56c5d550938bd7b04db89e04a58c1 SHA-1: 2ebd33402ae3742f39e0cbecc9619f11f49d0fb6 SHA-256: 240b493879441edcda8a4c16ea782a0c3bca50f417d9c1ffc149db9b0354f7e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dichvuketoanvn.org/uploads/files/50827746475.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3496ae15---58515277472.pdfIn PDF document text
    • http://kraciowka.pl/userfiles/file/47672401149.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/33668221128.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/lijosibufasuranagofomaru.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/pojekepabugu.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/wategegulopujefezupav.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/dejisuzekut.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/doterilodobukagaxiluxe.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/32021927672.pdfIn PDF document text
    • http://epmachine.ru/d/files/misole.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/sidawilelagolilugebaf.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/piruturim.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/66656682621.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/noguwosexuzewarebajawumam.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/sevigavejepalewezigipizux.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/19165793606.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59270518110.pdfIn PDF document text
    • https://halkum.rs/files/wokapukubisifofi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161591b1932163---89016450738.pdfIn PDF document text
    • http://hexindechem.com/upload/files/42101418820.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/28383574115.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/vixorotomukumosalavin.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pevumimafowad.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/wumazubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=batman+v+superman+ultimate+edition+watch+online+freePDF link annotation
    • 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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 11188 bytes
SHA-256: fe573589e499331eac2c992bfa407ef247bb41c2814156f788ab92616a808b34
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 20616 bytes
SHA-256: 1954dfe00eed36f52ac8254729ffeeddc96c482415e7b5b5c0160d1512177da4
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1