Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e4fbbc20bd05cf…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 10:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06174e85d1ba7a79d7ae3ad4c4e2bb27 SHA-1: 0821020a9fb461c15607c8f99a547bfeb2161a2a SHA-256: 10e4fbbc20bd05cf0b66077ec297be6bfdb0392fd43a715520bd9f07095dd46d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with the primary heuristic indicating a disposable hosting setup designed to redirect users. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kantipursecurity.com/userfiles/file/77460826236.pdf In PDF document text
    • https://gbagencement.fr/uploads/file/39437872702.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/kajojozipetel.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/18112013196.pdfIn PDF document text
    • https://fototipia.hu/files/files/tasudipokazubokukalomupoz.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/1057525351.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/jarazimurovopoxonopex.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lunexux.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14508951775.pdfIn PDF document text
    • http://www.andreapondika.cz/file/tosewalukop.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/vemidulikubiwopegososed.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2142bf9d---zevixu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/repovarefutomi.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/duvor.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/42550195402.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/titof.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090920264313.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pekoguvutefugoxivizexaju.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/minowofipupumu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zuremume.pdfIn PDF document text
    • http://tecksco.com/upload/files/tovazenuriton.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/43088275007.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349f9ae9c39---86868650747.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/22687284372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mini+putt+3+jurassicPDF 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_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 10464 bytes
SHA-256: 65b1c17128559259aaaa651bb9b4292e8626912cf76bba54a518118d2471f431
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 17464 bytes
SHA-256: 36f857ab6b3251ee44184450eb6898c9b99c8ac3aa209079e247a7931e4e202c