Malicious PDF — malware analysis report

Static analysis result for SHA-256 5732c92e5418df84…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 22:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dc2de3c0ab398806bf2b190a5f522f7 SHA-1: 376435eb8e59caa116605e3f1359b30ce678f4d0 SHA-256: 5732c92e5418df847ecffaa5bfce8a7e117f5836d9315113d46cd43a7199604b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://oniceh.ru/uplcv?utm_term=samsung+galaxy+young+2+sim+card+size PDF link annotation
    • https://tefen67.com/userfiles/files/buraremugiwemur.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/kaxofo.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/lejuzimibumakugenogixaj.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/31310216732.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/xozuridifabesuzapo.pdfIn PDF document text
    • http://ge-mak.com/files/55123901153.pdfIn PDF document text
    • https://forumsevens.com/images/file/zuzaxaxidurupuwonigagezej.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/10417241037.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/gazunubetejikovajenebe.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tikibis.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/lolaz.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/35588258606.pdfIn PDF document text
    • https://unitjaya.com/contents/files/genunakiluweto.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/80363567390.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/jusexax.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/83229538886.pdfIn PDF document text
    • http://sjhtractor.com/d/files/83928173615.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83497289203.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/40b05ad5169b10b92e001b0111206b42.pdfIn PDF document text
    • http://ossokahve.com/upload/file/60370898032.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/94352600606.pdfIn PDF document text
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed33c5a5---rogivofofematagawux.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/manasusiwuzumilon.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/pukif.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/55893179845.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909125128_9ol69m.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/65202432951.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_off0000b5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 15580 bytes
SHA-256: de37411a688bfd7a26fd1b1b046e5841757d0f89158a9594a2175f396f2d1752
font_02_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 11188 bytes
SHA-256: 8d5f06c5e6357aadce4e7a0654b2414201605c2c6be852d511fc84287395c3fd