Malicious PDF — malware analysis report

Static analysis result for SHA-256 854983752f7409ea…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 05:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7468b12e3d7f9213d07f1d65b3dbbd1e SHA-1: 5f472c46fdd974095cf2c0356a28a164044acc55 SHA-256: 854983752f7409ea4e7457df44022197f78958384f106f73210b1d24fcfb3103
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=where+can+i+publish+my+android+app+for+free
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/69575861306.pdf
    • http://spc1991.com/ckfinder/userfiles/files/23724276689.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/bonuziviga.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/lumapesoki.pdf
    • http://cathugo.de/res/wysiwyg/file/bolafabezowaniw.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/20464941849.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/41694088182.pdf
    • http://fosterfreezesantarosa.com/uploads/files/7061000681.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tufulonizekupo.pdf
    • http://princeverma.in/uploads/files/jawubugudipisatavokufewe.pdf
    • http://tokyosushilohaus.com/uploads/files/fejajubosikoxowuso.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/96993113789.pdf
    • http://cana.vn/uploads/userfiles/file/30799282707.pdf
    • http://decamiones.com/userfiles/file/21908949776.pdf
    • http://makassitools.com/userfiles/file///55702005848.pdf
    • http://achilleferolla.it/userfiles/files/7749528156.pdf
    • http://canadianrockies.info/files/file/98560238966.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/zemekidinutumapefavu.pdf
    • http://ferrocom-spb.ru/userfiles/files/87733412789.pdf
    • http://snp-ent.com/files/fckeditor/file/200892646961452ba03e58e.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613939e71dc46---pefazuxeturoxigugosotadu.pdf
    • http://quatanggiabao.com/images/uploads/files/32587946021.pdf
    • http://adabaskimerkezi.com/upload/file/sulawuretorejolivumexuni.pdf
    • http://jamalcar.com/userfiles/file/lapabuxasefaku.pdf
    • http://qlionshousing.ca/userfiles/file/29561804961.pdf
    • 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_off0000eaab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
font_01_sfnt_off000102c2.bin
db3c30e9eb20f42ca56bd064c7c0c01c51699804b49dbe2883e60508ff19560e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 11136 bytes
font_02_sfnt_off00011c4c.bin
29f12bb3b6f96239f700be60745d3eac67115ca044837bad71a2bded89bfc5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 18056 bytes

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