Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03e9c4c404d44e2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 19:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61ee0fa17d810e30a7e99f2bd0b8e6d9 SHA-1: 2628bdf8b7b015ee85b624185fd1d4852887dc96 SHA-256: c03e9c4c404d44e20471a32a2d257dc9c9c95e5737ba67dbad0f9d5b89929197
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML_NYX_PDF_MALICIOUS heuristic and the CLAMAV_DETECTION with the signature 'Pdf.Phishing.Trojan' strongly support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=protists+vs+prokaryotes PDF link annotation
    • http://kirakuramen.com/uploads/files/24365544453.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/52795401847.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/danixi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25063588a---2524164055.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/rugunisitof.pdfIn PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • http://lulanjina.net/upload/files/12375173612.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/gukulabinejevatexatage.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/89390977188.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/lazedamonenosusez.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zuzuvosedas.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a24d28b88c7747c474dc8e0707c4dd97/23219635855.pdfIn PDF document text
    • http://domosplast.hu/files/file/dijefelopipu.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/39747946098.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/darutepudiduje.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_543086C8B7C03E1C.pdfIn PDF document text
    • https://greenways.at/userfiles/file/16917041449.pdfIn PDF document text
    • http://kmsenior.org/file/files/mezun.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jaxirigijin.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/6072136969.pdfIn PDF document text
    • https://lorus.rs/files/rebogepuxivumisedenapan.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/juzopuv.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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 10368 bytes
SHA-256: 1428225ccf3f752aedc982dd8f332ba2d4eba8e60a1fa9e895bd2379406147bc
font_01_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16632 bytes
SHA-256: 565d4dd553991c9a0c6f4fcad4df536a98e764b751a21ba64459edc108be6fa1

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