Malicious PDF — malware analysis report

Static analysis result for SHA-256 11744e57d51b66a2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 14:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee6bca70850db92a503a80f86c925b08 SHA-1: 825e858df39f48a53a1bcef5ed1b467fcd5ceeb4 SHA-256: 11744e57d51b66a2f008ad6df5932986f3f64e794f5cabdf8b70c2e4d4834458
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://serramentisiciliano.it/userfiles/files/sobafagudavezuniw.pdf In PDF document text
    • https://paulogomeslda.com/userfiles/file/34275132932.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/99234093814.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vadorigeka.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/koveda.pdfIn PDF document text
    • http://lola168.com/uploadfiles/file/dutixidubo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/wigigivagerodatekoj.pdfIn PDF document text
    • http://biomehl.com/images/content/files/tipawemiruwalisezinadiva.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a8215ce---fawila.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/fuvapate.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/98997577316.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/53101289327.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/11438532447.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xerojuzadazo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131403c28017---53986326102.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/55039476106.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fesedumonuwog.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/48303767576.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/3792740683.pdfIn PDF document text
    • https://izometal.net/mm/file/tapomigigokomufope.pdfIn PDF document text
    • http://yuli-china.ru/d/files/53736574525.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/27295339661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+a+free+discord+nitroPDF 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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 16284 bytes
SHA-256: 831001c8f1ea2f52a8cbef5c0ed5a9bccc987aa28922702eb6085640d85657bd
font_02_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 10684 bytes
SHA-256: 0dafc4e6c1bbb754a07cef285f9070a7644bd4644f23b5f4d362d03526f4c7fa

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