Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a3dd3545cc3ba7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 17:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52c5ea1e816d4af84d8123ac4eaba9e2 SHA-1: 2f86983631be6013a061294bbaa5a5c9aa8b2c60 SHA-256: d3a3dd3545cc3ba79c0225dad9ad98e75df7d341b42831f4a3f1d3fe2c4e6273
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts and disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content. The file's structure and the presence of many external links indicate a primary function of directing traffic rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3efd24aa660bcde7bb09914235c08a49/segelofuwunosu.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/26291036905.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/41980699624.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/xituvubakod.pdfIn PDF document text
    • https://hirurgija.me/files/famovuwaba.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/72166333683.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/seluvubunomokisen.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/51878916645.pdfIn PDF document text
    • http://tianfonmm.com/d/files/19680117216.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/68387982755.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/xuzazogo.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renebileves.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/15971674981.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210910185340.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/72702498113.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/muvobedemuwunikiwe.pdfIn PDF document text
    • https://cicimanis.com/contents/files/53704104956.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109220347441857.pdfIn PDF document text
    • http://pb-book.com/user_file/file/zupofowamev.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/54137227334.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/bozujunedegajukuzoxalo.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/tapejefimenajaluk.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/nokobewojavijexevi.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/kifidibaj.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/vutemosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minato+x+mitsuruPDF 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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 17484 bytes
SHA-256: 78da45a9651be1107213355ef619ab5cc99033f77196287013a7fa134c189062
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10284 bytes
SHA-256: 923755cb3603ca86f33d49a63ccd870a85a4badf405ab8c4f5280d3ea12f25ce

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