Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9d4a0ec0b427fc…

MALICIOUS

PDF

85.0 KB Created: 2021-10-07 14:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6554bcbdd0615021cee1cc91fbe8093 SHA-1: d85dec11d019b8b946d9e7df73467ab37bd20398 SHA-256: 7c9d4a0ec0b427fcff54125e16adc63aafd2adcb04284d622bcc90d4cb40b9d5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of a link farm with numerous disposable URLs suggests an attempt to obscure the ultimate payload destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tsnpharma.com/upload/files/92477567069.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614309d436069---wukekirinuw.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/kemixuzonikatipi.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/pokerepirinegirogalonegud.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sajez.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/52668407649.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/rogenanikefuzabawe.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/kobofawubiloxamijufisi.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/51245045036.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bituwofomejulej.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/dakugapinemona.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/jopevavixelexifavuli.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/kodisepidimakajujafe.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092711560273499.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410d69d886b---xapolebub.pdfIn PDF document text
    • https://clubon.top/uploads/files/30651959669.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/60985774130.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/71547106157.pdfIn PDF document text
    • https://ocloud.millionserenity.com/images/upload/files/63923774221.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/68683644067.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/8765310763.pdfIn PDF document text
    • http://moretonassets.net/userfiles/titokotiwubesizupifa.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/35450552749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=matilda+guided+reading+lesson+plansPDF link annotation
    • 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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 18440 bytes
SHA-256: 490df3db6b956bcf579f916f7cc386695e991119d6f112079bf94bf2ff2f804a
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10660 bytes
SHA-256: 527c6d81edcc9190dd2e32d3f9dcf117903eabed0717c94a642703c4dc19cd2c
font_02_sfnt_off00012eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1