Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7eef152ef07c6a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 10:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3c98698fd2176d853b1d56c11d031d2 SHA-1: f732ecdc560e7569b5a35ec65fce00429d31fd33 SHA-256: ae7eef152ef07c6a10f0048d893728fd1ecaed236000fc956dba77fdd0af0730
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support its malicious nature, likely exploiting PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=map+fragment+inside+fragment+android PDF link annotation
    • http://ferramentabelleggia.it/public/file/92736819003.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e04487f4a---kuzagepumepadow.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/modojimesexakezunoduwelip.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/fujurugolezages.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/xejude.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/padoteriporexekok.pdfIn PDF document text
    • http://specialcats.nl/media/files/mifuvoxusu.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/11457805448.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/73179602109.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/47133159781.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109021108081219.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vibibakanowufibisexesu.pdfIn PDF document text
    • http://specialcats.nl/media/files/dujasopapufatixevepe.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/92110095027.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/wopixajadagojupekalawo.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/luzolamux.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/zojiboruzubef.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/66233646682.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/naxagopeloxodavevog.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/lowadus.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/muragumijo.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/nideze.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd8c539a3---30611728047.pdfIn PDF document text
    • http://deauville.ru/files/file/linewusumipefebugesetad.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/33212214711.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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10788 bytes
SHA-256: 3a7c97d2aee90a86d30aeeb0218b2d92e4c06f572d3744de0da3aeb89dcf08c7
font_02_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16308 bytes
SHA-256: f069471f67a9bd4b72cb50910919842d2f39763782b28cd391b39a1e2d9a58f0