Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d4b76853cd9bfb…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 19:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 259bde9c2be7251a3f00e6ca38d26e68 SHA-1: f1f1f904979782c6077b3b3dc067ff27a7905da5 SHA-256: 17d4b76853cd9bfb014f6356d9682031ae43295722a188a51798c3de0a439031
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to redirect users to external, potentially malicious sites. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://tavcam.com/upload/ckfinder/files/60709101643.pdf In PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/jenepufe.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/keber.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99412960729.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/66048372407.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zimoxoxulukip.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/33895680914.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/62975034571.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/zudopivajot.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/64756697233.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/mazabulinugejob.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/28411693443.pdfIn PDF document text
    • https://iwistw.com/upload/files/fotibapemupopunimoripo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pazagifasifedizozusome.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/ronefuv.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bategexoralimisubavo.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/94564907248.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2d6j4254hpimuc6tttpjf23ak7/49629696132.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/sizefibawokiliviwewiroro.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/6555890697.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/lafitunuperodel.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210904130459.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/48597083804.pdfIn PDF document text
    • https://everestart.com/images/stories/file/30267964835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hungry+shark+evolution+apk+iosPDF 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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 16168 bytes
SHA-256: 2c9342475bdb7ff1d55b7449d4f4e64b49d9a47195f81368e251956713a647cd
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10892 bytes
SHA-256: 900ad58758c918f4311d8a7b6adc9e3a89ee7d78fc6063a010bb2529042d91b4