Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd84b3c60554d033…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 06:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bcd9c9ae99e43d9a86b63dedd0efda5 SHA-1: cbbe422664762689301b094bf4c7b29cbac6b786 SHA-256: cd84b3c60554d033c01a3f9b76234515d4866bd41101b6561fa0671d4d5b98a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document suggests it's delivered as a phishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=fmovies+android+app PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613178e378bb4---3984155290.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zezebafurawijifuluja.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kizonutuvojixola.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/92390915547.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/42428628998.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45752496271.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/97898733896.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/64704225594.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jogekolikawuvilofetokine.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jowemivusewunuvev.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/22573870330.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/98059012872.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/75709812050.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/nozuzopaladamim.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/86892259197.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/1880189763.pdfIn PDF document text
    • https://magerp.org/upload/files/pedilikupegob.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/14866265297.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/89242190607.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/zuxororebasurukonezaxoli.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/kepizexomutewaxomozudus.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137820a801e5---muludunufotuvimuza.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 18332 bytes
SHA-256: e94821b67b8448d8b93a3b0cef8cac4fcb9586cdde0b2ca0e5c6754e69bc954b
font_01_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 10452 bytes
SHA-256: 59cab6526c13329c29eabe8b47983b10513baaa2263d788386dabd74e7d5873a
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1