Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2780ce77daeeb65…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 16:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd80e9f650441b7703807ce0dd131627 SHA-1: 9736362d94d2a56040ebd71bf6b50cde37fd5b55 SHA-256: a2780ce77daeeb6558ab3f243eea1c8e7fbf0c3113bb67f3cce2bb15c4d13178
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external files, suggesting it's designed to redirect users to potentially malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate structure for hosting many links. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://musicpark-live.de/userfiles/file/riwinugalusupogolez.pdf In PDF document text
    • http://weifong.tw/fckimages/file/kitizepukirisebikuxesu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/34719316201.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/52069313497.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/51626490480.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/34566253417.pdfIn PDF document text
    • http://coolscape.info/images/files/zogor.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/52764398045.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zunasatorikimetowuterut.pdfIn PDF document text
    • http://robbes.nl/media/files/63100103348.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/rupokiripupojazakabig.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6b76759f8---69452724502.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/tujejesovigalizu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/bonimujofav.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/71027011534.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/97214089173.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/riwokuvadumabigar.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/jurunarobe.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/96285660356.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/82446680119.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bisiv.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/38483655183.pdfIn PDF document text
    • http://analhospital.net/file/files/37369623626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+anti+ban+mod+menu+apk+downloadPDF 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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 11032 bytes
SHA-256: c376726e2648225555989ac6e320f7c5f212ef11318eb31163c6155fd3e14cce
font_02_sfnt_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 15020 bytes
SHA-256: ac6777287db119c1049d2fb09913919f51f774233942d18a64bdef884ae3b0a1