Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedd6347cc1b0cf8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 04:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec748c114df6f39a8a60309c1301ee28 SHA-1: 2bf8d983e476100265ccb759e7a20823535cdb89 SHA-256: dedd6347cc1b0cf83f0167c5151d8d3fcf10a20c11966ba7d31c77108741384d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users or download additional malicious content. The presence of a 'download button' lure further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://hanyangsteel.com/files/fckeditor/file/128290927561487bf5d95f3.pdf In PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/76786343336.pdfIn PDF document text
    • https://atavio.ru/files/file/kogibizukilesewaxej.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/1724428109.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/jilozupazikul.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/60919139472.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/rabatiwaximure.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7217de57a---35920445138.pdfIn PDF document text
    • http://farmina.ru/uploads/files/56337814057.pdfIn PDF document text
    • http://salespate.com/userfiles/file/tegezinojenimaxilusa.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/73197372754.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/53332396879.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/37892456360.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/48650813495.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zakevavujevilejuwivof.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/81132331115.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/bijuwokomagepuguri.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/famupefa.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/sorufatonemufapuguzuda.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/56043170883.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kojorivadesifewiruj.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2d536e0bf50745c517daa144e780b7a9/44183435690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=critical+strike+hackPDF 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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 10224 bytes
SHA-256: 36c2ef29cb9687ba4d279db59590a84594ce4fbbc5cbb465b8dce607df985de1
font_01_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 19604 bytes
SHA-256: e601962d2f40077771f6c46a9463e0cd736a07d52d6cddb1206cfaa27e008e55
font_02_sfnt_off0001317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1