Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b34621dc168062a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 18:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8dd211ceeb4bc8a9378bd5df6299c27 SHA-1: 298a25e31ba8c589d40c7a8ed63e99cb226a7806 SHA-256: 1b34621dc168062a53357d939e187b1a59ba036e16b9f33afa64367c3423f4ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious download attempt. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hondatayho.vn/images/ckeditor/files/rujujixezugexewa.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/juzofujatuvolo.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/9305570829.pdfIn PDF document text
    • http://brukbet.com/user_images/file/winodotu.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tuzikatadi.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/sudotebawapebipu.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/pimulaju.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/79545717863.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/7643134491.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jazojipi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e2ab5f4c89aadba6f65700d323c1a2a0/79996873718.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/73735045013.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/45607728707.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/19379195819.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/2139055969.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/nokorarotalopagifikovawo.pdfIn PDF document text
    • http://freetds.net/userfiles/file/wetiretolabe.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8a5a7bd7---xalitorogoxegoguxude.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/kasuxut.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/30591250042.pdfIn PDF document text
    • http://runbo.net/upfiles/files/1631259889728.pdfIn PDF document text
    • https://cian.hr/userfiles/file/puruxurusodojukoloju.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/99882338359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ios+13+rom+download+zip+for+androidPDF 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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 17564 bytes
SHA-256: 9980480da52fa75d37ba62bc36e0db03e65300b0866336efa169b71b5f81cb4e
font_01_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 10752 bytes
SHA-256: fcb51cb18270e112346c371a7521b2bd2e215f15406af12efe32bbec9b982a4a
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1