Malicious PDF — malware analysis report

Static analysis result for SHA-256 850ea2aecbe8150c…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 09:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3f8f2fada1495931cac2d08a6e45c31 SHA-1: 16ad0cce002f85f87d0e447baf8b3891d6931262 SHA-256: 850ea2aecbe8150c5dab4fcc9b2a87de84bd38bf3930ca3a7f2ea5a9cc4df7d6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface with a clickable action, typical for directing users to external sites. The document body is heavily obfuscated, but the presence of numerous unknown URLs suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://theshamrockpublecco.it/file/84666147367.pdf In PDF document text
    • http://chinawin-consult.com/userfiles/nozozetegikisufaku.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/41349722479.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/sugoluduzig.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/22380474451.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///7373504847.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/63927052344.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/kagizumokawuxasutonalila.pdfIn PDF document text
    • http://www.moulbaix.be/fck/file/579047340.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/tuzutazop.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/wimebowozana.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/nagixat.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/84172284445.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/47495147327.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/jawazejavagagijabuxam.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/53156936928.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210929073053.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/gujibezusi.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/30423933426.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/fukupok.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/meganolexoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=high+pressure+turbine+in+thermal+power+plantPDF 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_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 11016 bytes
SHA-256: cfe6540e527ff1b1d1b3b08ea8d6a9ea13d16565e482833291665fcd588bb279
font_02_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 14140 bytes
SHA-256: 9ca9f934513e5f68320c745d98dca5123e5d6eec3ba0ddaf56ff0a0bf356dfc3