Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6cd790a8b1388f…

MALICIOUS

PDF

70.2 KB Created: 2021-10-05 13:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f2cd1511747f5cb0b7027ebcc1f61e4 SHA-1: 664fa07696a166edc5ffdbc6ef0d072147ca6387 SHA-256: 1e6cd790a8b1388f22e24e61e578212e72c752d97e6c50456bcf36d839bd0d51
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/kajolexe.pdf In PDF document text
    • http://tznjl.com/userfiles/files/10291145373.pdfIn PDF document text
    • http://minhanh.com/files/66068392803.pdfIn PDF document text
    • http://mounceconstruction.com/userfiles/file/dufovifadenufajadije.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210915_202359.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/desaladukavitetesub.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/62016092636.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/potedaje.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/49079453032.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/lakinewodawavumidi.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/tapuw.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/80921262352.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/bixesogowezopo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161316337384b2---jipariranejexepi.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210918191445_0yv13j.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/75636750474.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/pukok.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xudin.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/99384479778.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/92418690483.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/bidasusogusirexojumopapa.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/43181210921.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/53805284739.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/belagepozugebatosibigeka.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/01lt56hr73e4rfiv8hg67j0im3/vuwaxubupowavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+email+out+of+officePDF 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_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 15464 bytes
SHA-256: 0f8a41580223974c89cdf12997f26ca3a73070a000f799dcae28237a0ff79fd7
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 10528 bytes
SHA-256: 22cdd61e98a2ef249a156532c54dcc65a6a99cab1bccec5204e886ef3516a49e