Malicious PDF — malware analysis report

Static analysis result for SHA-256 8945ec328fe84a5c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 01:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 079679bc7f8c5363d4af56020daa2dcd SHA-1: 8f62f70e9729830d7247eba07582759237fcb0c5 SHA-256: 8945ec328fe84a5c6c9aae465fb127fe5033e51da1158db0a4089bc307212971
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://clicksnepal.grnca.org/img/files/files/dukenogukejoxogaf.pdf In PDF document text
    • https://preprodpcb.com/userfiles/files/33291857251.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/lojeboxidibo.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/wezinafunobomofetofi.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17768171775.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/pixerav.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zogovaberapotevozisufik.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/13886453963.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109090636152287.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/lidivoxisozufuwere.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/12061848246.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa9a2d3a2---mapakoporosejikedadew.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/sezukonudujowudezexes.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/vugejuwebusubagabik.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/xatugupejed.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/bomekefefumiwo.pdfIn PDF document text
    • https://shibbirs.com/media/files/16512502877.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/buzupudeso.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/talajegosoxujusanewevet.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903230326.pdfIn PDF document text
    • http://montesantangelo.it/files/files/51139256273.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326cef8179d---bevelegavepabazogagat.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zuseniruxulukiponaxafule.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/folemojuzexudelavimef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+see+deleted+browser+history+on+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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16600 bytes
SHA-256: be8298397cd370fc75c78616163eaab7699d1913470c0b975f8c070be2bc26d2
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 10676 bytes
SHA-256: 035d3c150103633b90e95db5f6c8b49886ab95f8c2878b88a52cb43dae08e521