Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce662c0ae9d70b1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d2c7baaf1a6639476484633366538718 SHA-1: 2d438ce49ddd10cbe70848957aa508ceaccbab83 SHA-256: dce662c0ae9d70b1dc6bcfd4529d448e16b6652f4295ea07fceb6d74bcdb74bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable or unknown hosting domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/modavuvipazagizobavan.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/poxuromekifilorubufolu.pdfIn PDF document text
    • http://linker-apps.com/files/fewulu.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/regusixepuxo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1fc2020f---xuwokakokuvijivetazavux.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/60893055604.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/70748494627.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/pisobitob.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/tikugimidevotub.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/jogoputudajozarimagozalis.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/pasewuxixalit.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/55150025184.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/73516124743.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/55114862403.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/71981795862.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/rojefuvezigufozavep.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/sigolisoxetobituganu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/12212273156.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/gomuparazufoduwusexev.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/2820275355.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/35149692270.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a60488bacd38d71ba85282dce5c5a42a/63245880392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=low+sar+value+smartphones+in+indiaPDF 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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 17972 bytes
SHA-256: dc866d174ba08c69e0748c464f5ebab1718297c316f9f75f19bbcbac33f07c17
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 10864 bytes
SHA-256: 258625fc0e49b47f045c46d25f60f5915930b4bb1fdc2fdef4b9901a6c734160