Malicious PDF — malware analysis report

Static analysis result for SHA-256 188c0e5d29180482…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 06:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed4d6bf1183eb7488c4266dc8f0bfb88 SHA-1: 57d9358ab92c2cef793612184e0fdead545a263f SHA-256: 188c0e5d29180482bb0d6aefc6a610a710c767a1efbca1e02033567f600fa0e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://dastone.ru/userfiles/file/17183791198.pdf
    • https://siltri.com/fck_upload/file/nojevisogifetut.pdf
    • http://we-women.de/default/files/uploads/file/bukiwuzenu.pdf
    • http://radiopoint.cz/userfiles/file/tubemiwimuxi.pdf
    • http://arabic.cz/ckfinder/userfiles/files/rafutidaw.pdf
    • http://whuntex.info/userfiles/file/lodubuxovukowatapibudoj.pdf
    • https://anctools.com/ckfinder/userfiles/files/19417284526.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/luxolunu.pdf
    • http://ttc-investco.com/img/files/vuwunosakizuwovibobuw.pdf
    • https://deesudcoolingtower.com/userfiles/file/vexujunetubutiri.pdf
    • https://pypconsultores.mx/userfiles/file/7843588186.pdf
    • http://teleinwestor.pl/userfiles/file/zarokepupoxolu.pdf
    • http://vietsinphar.com/uploads/files/9626542150.pdf
    • http://aaas.handyfriendship.com/upload/files/89462222132.pdf
    • https://dampinggame.com/calisma2/files/uploads/zobasakaxisufid.pdf
    • http://polipack.ru/content/file/61009533654.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/42142133492.pdf
    • https://eldorado777.ro/upload/editor/file/27661738683.pdf
    • https://media-get.ru/userfiles/files/17047869116.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/sut2fje9ako4hib4cjoe9ptl00/dibixazesivovogikaduvusa.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/kimofaxojedopov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+batman+soul+of+the+dragon
    • 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_off0000b55f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 16792 bytes
font_01_sfnt_off0000cd76.bin
8d31f739ee144a4dc329aff3c09e4224666da6cea6cbae9645874b113ae1e749		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 11064 bytes
font_02_sfnt_off0000e6e3.bin
4a96c605b543d05021a94ee4ed825066f8ab58f8c218a74378be69c9585e72d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 18300 bytes

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