Malicious PDF — malware analysis report

Static analysis result for SHA-256 a749ad19ca3c8e00…

MALICIOUS

PDF

75.7 KB Created: 2021-09-29 01:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b9b10b80b1a5fd3d4ecdc1a66491575 SHA-1: b5ae662f58b2a04c568daff79fcf646c483a2f6f SHA-256: a749ad19ca3c8e003bd6e2c0096da15d5a7d36d2de5f7c3d0159dbf23bbe2fab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with one URL being http://radis-rrl.ru/userfiles/image/13106521111.pdf. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://radis-rrl.ru/userfiles/image/13106521111.pdf In PDF document text
    • http://melodylavernebettencourt.com/media/file/megoweveso.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091204473074.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/57353437831.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/90070012226.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/43987267697.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tetusadalusadasusaxovame.pdfIn PDF document text
    • http://eksternest.be/images/file/10369227590.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/pidenudesikafuf.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xebinig.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d8c4565a---pupelexunibo.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/solerix.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/wawidaxo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/104f4ab97f7f5722041b09a24ac4b233/rexulogojov.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/13733861469.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/72660982695.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210926034519.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/lutafade.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/69103862712.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/40367168424.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/loguweme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=super+mario+gameboy+emulatorPDF 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_off0000ba8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8B 21080 bytes
SHA-256: 163953a5e92f7a1b67868628662ac327f8ff9f36134f3bd68ac2e94a4c1c962b
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 10752 bytes
SHA-256: 853c6e22381aafc90d8ec1ea3d1111c258e243fcd0bba304613238ac3d99c654

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