Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc525bd951b8d97…

MALICIOUS

PDF

73.8 KB Created: 2021-10-09 00:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d7b173b45b43e07bde2e7cdb1882ee2 SHA-1: 87504299cc66c6f82ae3766733fc95ac1909e2a2 SHA-256: 7fc525bd951b8d97a7cb5e8c59977cc11dada2b19b6798260cdaeb2eb030977a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The PDF contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious content or for SEO poisoning. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/1266830380.pdf In PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/dovoga.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b092ac21b---62718809536.pdfIn PDF document text
    • https://hot-pol.com/images/file/wemidasuvajulora.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/pitaxetuk.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/rewoselejaxevumil.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161589574edf95---goporubunexenunobipat.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/48673850051.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/54785893456.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/44739970625.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/wilibesorijofasegifalu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/22722125910.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/tofulifemusita.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/sutefakazivonifoxalapupo.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/58427920266.pdfIn PDF document text
    • http://ladna.pl/user_images/file/16316926911.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/nerire.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/paxikuzebipemedesamepivax.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/7852491864.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/walutexaxusevu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/papusidogopusulemar.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/gifasogadapawadij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+sweet+corn+made+ofPDF 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_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 10772 bytes
SHA-256: a5b1df4ba12d0abf1de64afe6e7405757c2cf3a769fa7af3e4d5f30d7176f67e
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 15920 bytes
SHA-256: 89bd292e7cf8a3c1bbfb5e3be47ec8404dc39f9635925486c5fcf8dd60c3b870