Malicious PDF — malware analysis report

Static analysis result for SHA-256 b856aa1090f569d8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 03:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11250c5dac3af92376b8329d0d011560 SHA-1: 71a5b0ced228e573af5856002dc39754e5af164b SHA-256: b856aa1090f569d8ccc2f5c19cd6a62429725e06e90bea320660cf7e13b1b8ba
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, including one pointing to 'nomylo.ru' which is likely a download lure. The presence of a 'download button' heuristic further supports the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=super+suit+mod+apk PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134c081df10a---51225602518.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/jakozabiru.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32986972717.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/xazimeselimopipalav.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/nidodamudeganetilu.pdfIn PDF document text
    • http://teresachild.com/upload/files/72858833249.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/tepufafegetuso.pdfIn PDF document text
    • http://medica-brno.com/files/71026255211.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/86567562502.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131420451944.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/64646844995.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/40171162852.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/59173500382.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/45563457959.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/7421724134.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5igdu8u50r1s949doff8vtkqjt/89301641929.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/52931726011.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/52235905150.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/46382331662.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wisirebukom.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/87259445665.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/bilefepawutodabubunax.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/zifuzet.pdfIn PDF document text
    • 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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 17624 bytes
SHA-256: 172c93fc550dec5dcb135f88a318d4fa5bd58436fae575a7901044f938dae943
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 10668 bytes
SHA-256: eb858a096df2c1ffdc4f37fcd577f6db100d717f6a996e447ff47b05084feb1b

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