Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd674bea52e00a1…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 14:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b54d262a846f04a3bdbd0fabda390d92 SHA-1: 6843e599ba8460b3889112b5fa938b42c42d8de4 SHA-256: 2dd674bea52e00a1b7828e28ba08fa63fe54fbaebf158b848e9180b8edcf6f1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=top+ten+sexiest+fortnite+skins PDF link annotation
    • http://yejida.com/userfiles/file/dagibavilovinanisowos.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/52900902582.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/fogetilevebuwepo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a5a68c6---12855403717.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/biwom.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/19843988776.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/jimibukifevadinokapi.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/gajobakun.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/gezojolimeriretoloxi.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/mitogasale.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/defimu.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nutadisijumiwo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4209908cd---wopifijazobuxetezurena.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widafezipogesusejij.pdfIn PDF document text
    • http://tianfonmm.com/d/files/gimapujamedaxedajilus.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/noxojateviwezamukagepako.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/petevisutop.pdfIn PDF document text
    • https://sergiomauri.com/images/file/99655064666.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xujapagisibi.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/kiwitujixizuxigilarivufa.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/sibogexufajifowukod.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/3788821973.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/22387814757.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/duwijivasatumevopemige.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/403559892.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_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 19372 bytes
SHA-256: ff2cbe34c9e8c3ce5d9acd10fed52509a824095d950b383f0fc6e7d0436aa222
font_01_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 10300 bytes
SHA-256: 4cf290ae00b73889ddf3ec90b508a940dc3336d4517d7e9770b8f530537aa3b6
font_02_sfnt_off00013d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1