Malicious PDF — malware analysis report

Static analysis result for SHA-256 900477b6e48e8857…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 08:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcdd1d2ca00f377510761bb06e4438b3 SHA-1: f79aad057e725d4cc134c8291932c4e94ade24c8 SHA-256: 900477b6e48e885755d116c2afc11a6243108db00071f0fa14218307cfb042e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the final destination. The presence of these URLs suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stgeorgedentalcare.in/ckfinder/userfiles/files/pebib.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/71071827889.pdf
    • https://chennothinterios.com/uploads/file/norejipakemonak.pdf
    • http://barexkft.hu/userfiles/file/59324912181.pdf
    • https://mkontakt.com/dat/file/65313815476.pdf
    • http://studiotrusso.it/userfiles/files/47241979348.pdf
    • http://newtrichur.com/userfiles/file/57848154715.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137989826ae0---novuxawejozotexafuwu.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/tosetedotosamawewenabuwe.pdf
    • http://djpress.pl/Image/files/16966496966.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiletaxadukadoferefilubop.pdf
    • https://smartstone.ca/userfiles/files/68280795965.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/bazizinokubajulo.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gekarelizimafurupariz.pdf
    • https://7mark3t2-7aya.com/contents/files/lozopobifukiratadezomuses.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67e2db543---69158543868.pdf
    • http://mrybalko.ru/files/52476634988.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/84235534505.pdf
    • http://tottazo.com/userfiles/file/kimajawawakesuvofixa.pdf
    • http://gzbaosui.com/uploadfile/files/dasijejevuw.pdf
    • http://eot.mn/uploads/userfiles/files/12779017551.pdf
    • http://riasztoszolnok.hu/admin/fck_upload/file/lumejerajeduxirovobut.pdf
    • http://architettoangeli.it/userfiles/files/40644365750.pdf
    • http://exmar.it/foto_fck/file/9428857549.pdf
    • http://ajtoablakcentrum.com/_user/file/7389682108.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=constant+bloodshot+eyes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9f.bin
c0cb0817a4c2d82be866d0fbff20920f59320f6832ceab3675a7f7fe0030912e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 18392 bytes
font_01_sfnt_off00011a45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
font_02_sfnt_off0001325c.bin
b001bc2b45088adea0116ba3811da8a1680832ec81a028ab36c3bb667af87f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10440 bytes

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