Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8d6537c28694a3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 13:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b0d0b76529b39a0d2da15a0e40adbd4 SHA-1: 2dabea285b9d26ae709befd0aa6e7a14a2529da2 SHA-256: ce8d6537c28694a35e14ede578084a11f2f3d6ac0734698783319fe747a0b389
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to other PDF files hosted on distinct domains, suggesting a link farm or SEO abuse tactic. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://wic-net.com/userfiles/file/70344122161.pdf In PDF document text
    • https://nhahangthanghuong.com/uploads/files/vivelifupesujevumivinev.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/tolomakukizune.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/42975023505.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9c5877f13ae10a783ce69002e2808622/vijud.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/59772878649.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/jotitaduvagederevox.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/26274046760.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/todetuwutava.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17940930310.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/99925440979.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/37459615588.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909015220.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pazob.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/femanoratunajosotifitod.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/wutaguvalumusedavazop.pdfIn PDF document text
    • https://labelmarket.pl/data/file/danitumedukagalotidatepit.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gelomagativipuxadamud.pdfIn PDF document text
    • https://emmaushuis.org/pages/wavisenexalazafes.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/vupaxategax.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a34aea2d8---99597796181.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210914095102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+access+sim+card+contacts+on+androidPDF 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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 17736 bytes
SHA-256: 1c60744500c2edd4b6c85f0459dd3a20187653153d121d4d8bc6070b7d69df50
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 10560 bytes
SHA-256: e4d6afd54e40f0661ab5dbb44f5f231ac132d1d7ad75867dc1c75a4d71f16268

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