Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcceb8975996233…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 19:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f784c9a03c97017feeb1a21451be12a3 SHA-1: c0df1de0ff81f6feeae4214c5ce2fd65f349e98c SHA-256: bbcceb8975996233d71ec3e81f85a099ac62cde44a919090df335f397edaeb02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious content, likely for phishing or to download further payloads. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=the+e+myth+revisited+summary+pdf PDF link annotation
    • https://ibliberia.com/ckfinder/userfiles/files/narekilipatu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9afaf0a90---28323122463.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/37407786891.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/71628862665.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/lalazilugerijo.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/sozagezusekonovofutoju.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mefijofa.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/99036269208.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/63839238264.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109161418073846.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/fiwimetezurabipiz.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/62704504522.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/begoneti.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/geroxofebizegixorip.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/vudulepositekur.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/fadifak.pdfIn PDF document text
    • https://fond.ru/userfiles/file/laxud.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/povuwudalatazakofo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/judofaw.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/37176137970.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/javoboxudojajumewu.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/xavezesuxolopivi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/59880034787.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/48804630671.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/76293432923.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d0b270bf42ebf114668a2ded7cf4b09/luruvuzemofemebinitojuni.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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 15496 bytes
SHA-256: 62f3ee0deeeff67feac23d868b1beb5ecc0b744ed9355ad5b200c14faec75b7a
font_02_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 10736 bytes
SHA-256: df0a6f0372b3affa1e93ec1e763a28a406db109463342d18f1ec23749231620d