Malicious PDF — malware analysis report

Static analysis result for SHA-256 521f06f1da1ee491…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 10:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c378c95dff01d5ab8b6a439259bafeb1 SHA-1: 123b5e4ba4ab6032e93cea46899674134c4e7db8 SHA-256: 521f06f1da1ee491cf85825c4ffc71dceac2c22d3399ca2a3ab74f0de3ce306d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drnanemilk.com/tctt/sites/aaa/file/jolubusirawafikutegisof.pdf
    • http://delannahotel.com/user_img/file/wadimibelon.pdf
    • http://bbhshipyard.com/userfiles/file/44137048674.pdf
    • https://concertwristband.com/resimler/files/82390085800.pdf
    • http://xn--e42bt3l.net/upfile/files/venaparitagilogukisag.pdf
    • http://energy-labels.nl/userfiles/file/wofikobexu.pdf
    • https://belitour.ir/basefile/belitourir/files/botutesubekoxeviriwuw.pdf
    • http://daivupaint.com/img-chamthi/files/83753971707.pdf
    • http://botosani.ro/img/uploads/file/2052318887.pdf
    • https://m-astar.com/UserFiles/files/33288980610.pdf
    • http://ombs.ru/uploads/files/nujegetamimafose.pdf
    • https://ddshower.com/ckfinder/userfiles/files/morexixisemupovonowuvazow.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/xosiludibeboximomum.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeea3b804c---52885755543.pdf
    • https://gesema.com/UserFiles/file/14768332444.pdf
    • http://technimexvn.com/images/ckeditor/files/tolafeximolafukupebof.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39271846691.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/kejodutul.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/28674672309.pdf
    • http://fskyok.com/uploadfile/files/77872219714.pdf
    • http://krupongs.com/images/file/43581522435.pdf
    • http://gcsiva.com/files/userfiles/file/40601950595.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afed6a3a7e---ximef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=world+biggest+powerful+country
    • 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_off0000ce9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16792 bytes
font_01_sfnt_off0000e6b4.bin
359be8c914843c2b860f1944b1b6997ac3bdada854cb7ff739c9f2ac9d63e9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 11068 bytes
font_02_sfnt_off00010036.bin
d8ad18d6822a3b38962b00ecffd207d8ea536d7a0126b50f8a6d65f8bddf9844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 17336 bytes

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