Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0fac6bb36e2f03…

MALICIOUS

PDF

78.5 KB Created: 2021-10-04 20:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acaa62743700d9b205c30eb325ff33c1 SHA-1: b38f13dd0cd7b0e3ebbca190ed00e4af09ae5c5b SHA-256: ce0fac6bb36e2f035fec465ee53179a285e21c20860d75dc1edb4b133f29cd46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=ms+word+for+mac+torrent PDF link annotation
    • http://zoop-tech.com/ckfinder/userfiles/files/kuwukenugowa.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/52655131722.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/suwimubokup.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/43867981722.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/99307689061.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/74844630132.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/bafopewo.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/57395201448.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/97715729127.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/8686908983.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/78641519424.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dukiji.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bazopixewupamiwasamut.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/11909404172.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/kodinolovojemom.pdfIn PDF document text
    • http://marymo.ru/uploads/files/pibiriwumiresi.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/gefux.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/21709343334.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/fumuzexe.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/maxipa.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/dakutijonumerojorela.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/guzadoranorowal.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/papugusinun.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/lumenezanegivujigidofe.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wegebizagofat.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412acf8a5bd---77113988272.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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 10576 bytes
SHA-256: ae05c2201c08c72e7dbcebe9a61d17cdc1d5e52d6012544d4c25e374e2a72fbf
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 18112 bytes
SHA-256: 2ef34dd6708262f225efbdd827efaf601ff660687157cab9f7ce9236c8ee12af
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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