Malicious PDF — malware analysis report

Static analysis result for SHA-256 1902937740c50d7b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 01:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7d2402f6220acf02a9102a12f7dbd1d SHA-1: 4b24eadd0bb3fb8f0c82f9a2082ae932d44dc0e5 SHA-256: 1902937740c50d7bb33d23062350575fd4e2d43632fa7f4b387bee2c4604867f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on disposable domains, suggest a link farm or phishing operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://catamma.ru/uplcv?utm_term=how+to+sync+music+from+pc+to+android PDF link annotation
    • https://braus.uz/images/shared/file/43096904806.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351920a6e04---53945727785.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/setolidefupovubasosexu.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/92215367165.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/13219537466.pdfIn PDF document text
    • https://ratoempat.com/contents/files/volemuminakegu.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jinerujizon.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/91611002314.pdfIn PDF document text
    • http://melvin.cz/data/mezifoz.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/48068555785.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/xanulurisoviribad.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/20937039312.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/68850934454.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/didanikunutasokusina.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/sunomixosubugenofenoxu.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/menudejevokuvelavido.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jukufaxikaripalovewikajo.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/solujezuwonivukadafuweli.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/22075451761.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zudunanuxasesibebew.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10896 bytes
SHA-256: bb567c0764f5dde81bf00c43b57530603d8b1b974c2ed7af94e0af5ba166492b
font_01_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 17676 bytes
SHA-256: 22f816f7244872130018e26ffd7c2f2915f563a88df79ff8f01ca5070e5de9f4
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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