Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a3fd96789d50e7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 12:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c4458d119f447c87b6712ea6243115b0 SHA-1: cd1953c81c6a87b1162e4f4b262f886cdbdc4763 SHA-256: 83a3fd96789d50e7d77e2ef71a261cb45530b98cd428e47584eab77ecfbb132a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=simcity+money+glitch PDF link annotation
    • http://futimisdev.com/userfiles/file/63132834725.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/mazexezetifixopako.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/48870522913.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/74871950093.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fetuzodofotetebudumodut.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/98882941277.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/bosipiliragibopi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a4232bc5---waxofigu.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/71404586153.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/56814679385.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631134565.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/pezixe.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rujetadiso.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/39353366962.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/rajixi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad4508a16---7789467299.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/ruvow.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/wadevobak.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/53264742876.pdfIn PDF document text
    • https://durimawar.com/contents/files/92429564020.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63036724536.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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 17448 bytes
SHA-256: 4e6a61c05d96a464fda942f4db06ca255f69bbb1b4d6e0c772e16fb1d9c48769
font_01_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 10436 bytes
SHA-256: 0c2f6fc6e11be2b20dc1862b8d13609d087e90c959b36efbcaacae33221d9e3e

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