Malicious PDF — malware analysis report

Static analysis result for SHA-256 24119fed5d567ff1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 11:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 051b18a4bfd39db1b99fabefcb7acd2d SHA-1: 68dd161e8ca605042ecd8e7c5809e05a9c6fb811 SHA-256: 24119fed5d567ff11caa98c6e12c1dac4852e73d24eb62d853de4290c8052bd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to further malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=best+software+for+ui+ux+design PDF link annotation
    • http://ohmytour.kr/FileData/ckfinder/files/20210915_8DE213160777B9B0.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/96420689193.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mazetitovofigosebimokugof.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/tukonimites.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/84992651524.pdfIn PDF document text
    • http://infunplastic.com/d/files/15443088246.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/81973734871.pdfIn PDF document text
    • http://dakmet.pl/upload/tafofabe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2862d88ed843bc631a75737ecec8d739/50576686392.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/nuvekizepudek.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/53452725529.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/61976220838.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/xinemufo.pdfIn PDF document text
    • http://0048.pl/48files/file/25490878257.pdfIn PDF document text
    • https://tavio.ru/files/file/63210939320.pdfIn PDF document text
    • https://domilot.com/uploader/files/71513677956.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kajiruxoxenidilevig.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/87464938185.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/9859968724.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/winujipafup.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910050804069.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2073194779613cc93c41fa0.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/84874143731.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/winetoriwuladonipif.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/raxubowodopez.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/55067845695.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 10824 bytes
SHA-256: 40ad862b7366e878d0f95b9a9738ac5f60e8c6960c0692e833d40131d7ffca14
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 14692 bytes
SHA-256: 4b888a0d7d51c4de6169c2e66e39dd0576e8c3a81bc82d86b80f7583e274a355
font_02_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1