Malicious PDF — malware analysis report

Static analysis result for SHA-256 403064fd4294c901…

MALICIOUS

PDF

95.8 KB Created: 2021-09-12 23:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec216a88819e81afa53b9051d58bef51 SHA-1: 78d2b2140cbf513e8d79e4b3e76a6b86a8a13d0d SHA-256: 403064fd4294c901844cd901131439aa770a6adb5a7814fb79015b9b00fca08d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that this document is part of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=life+of+the+party+full+movie+free PDF link annotation
    • https://thuaphatlaihoanghuy.com/uploads/files/74783274301.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/80565051051.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/vipolozobita.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/zemozubunexojedeboz.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/30363777069.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/pefuregizokix.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/xuxugulujonexu.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/19282246914.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/99541236276.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/karotirofolumanowapepos.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/29751237512.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/60732653702.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/bikazegowokeb.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/bilewijeripomesizuluba.pdfIn PDF document text
    • http://symbolfoods.com/files/file///75261410209.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/35988492185.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/4148983262.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jiran.pdfIn PDF document text
    • http://contextuae.com/resimler/files/bemab.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/bulixezaxuwuxi.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/76560552916.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161390aae33ad9---puxasiwosedese.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/61690185843.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_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10588 bytes
SHA-256: f7782ac14860d72f3aa30de67cb466fa2ac554c914cfdba19ed0e212e82ded16
font_02_sfnt_off000142fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 18196 bytes
SHA-256: dcc8ecd5856a3735763276ee2610129916eb7d879188b88bd424a017d5b1ff4a

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