Malicious PDF — malware analysis report

Static analysis result for SHA-256 17572d176dcd79c6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 02:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9cfaa83e8a3f7e385e77ddedb94d51cb SHA-1: 855940b93ae93e3395ef4c19e3043f1f904b4412 SHA-256: 17572d176dcd79c6eba42bf771b0f185460d526e7c66288fddbd5dc2047b742a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://robwalker.net/fckupload/file/79036849427.pdf In PDF document text
    • http://kryotherapie.net/neu/userfiles/file/94874084394.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/46267386360.pdfIn PDF document text
    • http://maksimetall.ru/files/ridiwikavevamikowawod.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/zedufojatugabubusivur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d397b238e4---wakogelob.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/18411437403.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/75668026039.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/bizaberesajinikobabosesit.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/5040254110.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/68782094207.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131f393ad614---62550309102.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907145921113.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fuvafukupelejitunireduk.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/12918400681.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/kibadufitejeveji.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/wedimovojoxosasoxej.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/23243993935.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/74316816099.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210902101112.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopexapabagakosadig.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/39740009565.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/bugilizufukumipanalor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=magical+mirai+2017PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72F 10288 bytes
SHA-256: c148de34390755ba20281051dfa216c04d62300f2a5720919441b97e875b1d43
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 21460 bytes
SHA-256: 8634d6a93797f714921970f96daad5d860420d9d408dae1ab45550f3b38a5a95
font_02_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 16372 bytes
SHA-256: e67b865c3b3a7551712cac7bee61d129e0933938f15138fa982ddfbbf91b4081

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