Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b8105ac1f63603…

MALICIOUS

PDF

84.3 KB Created: 2021-09-24 04:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75dc55e2f27e7b645d8033851fd8b713 SHA-1: 16688efc676fe48556ff67468b8cb3ba7bbc747c SHA-256: b6b8105ac1f636037833fe3cca5e89abcc2217630c7c0167b296a356615a25fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the redirection of users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=how+to+add+disney+emoji+blitz+keyboard+android PDF link annotation
    • http://castrolmintabolt.hu/images/upload/file/dutolununenamani.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/tewuzenepoboxez.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/79791208883.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/pajowalefedegedi.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20974314602.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/vuxixurafokopekasufa.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/61839273705.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03dcb57d---44185622658.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/retoravi.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nusixifogefofugaz.pdfIn PDF document text
    • https://phoneeucom.zabolekarburgas.com/userfiles/file/88480217346.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/41284022025.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/42350088859.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/dekufuxiwiw.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/rowagobifibafitodexupa.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/vunumibuwofakizitug.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/nulegugugefutugoveki.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/89941296685.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_DE99C114E0B9A302.pdfIn PDF document text
    • http://jucal.es/images/file/10118085726.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/jepududateferaxakejigi.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/gejanotemukijakunaxi.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/64587446482.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/bebezefisulopuxejibesup.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149890656691---84095858080.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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 18380 bytes
SHA-256: 82605bbe722e3197829badc964620ae34b50bc5a6b00e1a45632b1503d9e8a18
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 11024 bytes
SHA-256: 3be4339e37e44823818e3213ab2ac7a24c2b4c212480a42c32095e2348357b98