Malicious PDF — malware analysis report

Static analysis result for SHA-256 94db9d4f95abdb1f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 05:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7065fa56232d9df19eb8495077eacc10 SHA-1: d67bbe514b2dab7ade1efcfbb92ee9b4e46caf15 SHA-256: 94db9d4f95abdb1f653f8a70d6fa7a889da2b21145d54eaaced0d933ef6af330
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, potentially malicious sites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=supprimer+les+pub+des+application+android PDF link annotation
    • https://www.assofmt.org/ckfinder/userfiles/files/zosadopapup.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/gaxipexasudafuvagowi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328fcb43bc1---sarasa.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ee732b8d---20728172628.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/lagevobirekodujiw.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/vabovebepepuloxo.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/zesosulokufufowosadetik.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/3123254807.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109100458346531.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/24542512366.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/luxesemeniwofoni.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/54874167637.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/kofogatazatabawomonovo.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/45686471392.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/gufofakax.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/kogani.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zidiloselevurub.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/bawopexesixenibiv.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1953966394613837309d1ce.pdfIn PDF document text
    • http://digicpictures.com/downloads/7282030565.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/1517003236.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/dinezoruxolavugog.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109021617475354.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/67726707110.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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 10992 bytes
SHA-256: 3b6b24aa573d5c1aa32b049d977764defe41a6ac1a3ed19a1f2dde5555083fd9
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 18328 bytes
SHA-256: 7c4b0c0a4390b756fc919afdbaa357d6daa014e6b4984533470366d254428c10