Malicious PDF — malware analysis report

Static analysis result for SHA-256 6153bd3152385929…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 10:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cf5ea307de6606292355af6ff1f47d75 SHA-1: 85aa3e640bc9e62890da3e3ec8fb7a3fcae3b703 SHA-256: 6153bd31523859296db30072de675084c47219329a3063414211300f4bde59c3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm used to distribute phishing content or malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://konsultacjenaukowe.eu/Upload/file/68747460926.pdf In PDF document text
    • http://agro-norwa.pl/userfiles/file/xagifunusibikopuletumor.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/42243309494.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/11575755776.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/nisaxusuwixojebufabakotow.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/gitezusiganotalobuxam.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/sumalujenilojogep.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/fenupizinipumefapuserez.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/dikare.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/2128541788.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139d0d99db---jalatotexixe.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/jokozavukawisite.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/finano.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338c5bde4d9---bavurekokafatal.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kovokupewebigugora.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///ronutumimipudizij.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/37659498380.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/61847132781.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/99885368661.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/mutosetiripusigikib.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dunifimosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=super+mario+advance+1+romPDF 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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 10656 bytes
SHA-256: e0f92a68e6f507bef506e0dc50988def6aeb7c7161b50ff40483dc0f9bdde4ff
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 17212 bytes
SHA-256: c48d03e20c610ea34754e5f8569479c00c9200d688cca203b213c825b615042e
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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