Malicious PDF — malware analysis report

Static analysis result for SHA-256 89adf5fe94781320…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 16:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5978ec3e2c7b5826431884d3514da581 SHA-1: 708f3368eec67bf394cabaa8740b857ec575cfa2 SHA-256: 89adf5fe94781320face936874994cb728162a6350e3e02bd6367bac033d3cd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF is a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lehnerkom.de/images/uploaded/file/kozepene.pdf In PDF document text
    • http://www.larucheapain.fr/ljk/file/68804746258.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/65811405782.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/56879768672.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fumetotebekogebapage.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/kolewexasudo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/97838133081.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/13300954953.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/gofurekoxeketerusomavo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fibaguripig.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/guwudis.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/8f2c453b02918c5245ce0b330b6fa9dc.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/49e6f78ef9568b600bb0b4bcf3d1a97e/mabeworugelifotevowox.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/98588941409.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/gotizepa.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/lazowopugupisufusidi.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/soriri.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50964168422.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/ganasepede.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/ravefiruwuzaderapereri.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/5761366362.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/21599666474.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/48372119860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=digital+wellbeing+timerPDF 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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 18200 bytes
SHA-256: c6c1cfb8913d4b5a80611d472104b9292bc9bc3b9d4f82401b4dd638fa699990
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 10392 bytes
SHA-256: c5827c3e5299a070b0e6ebf2343aa3c63aa10e1612ab1bd3fe846920f098ed2d

Open this report in the interactive analyzer, or submit your own file for analysis.