Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1639f3851a6eaf7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 17:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d275b5b60a0fed049b653ba69fd7faa4 SHA-1: b03ee86c52c318d271c1c71de33f43fbddbad5c3 SHA-256: c1639f3851a6eaf7067a43913730f59546353d373c77f3ea4dbcb4984418416f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, likely for downloading applications or further malware. The presence of these links and the overall detection suggest an attempt to trick users into visiting untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://benedictinoselrosal.org/ckfinder/userfiles/files/vepajiju.pdf In PDF document text
    • http://ymjgolf.com/file_media/file_image/file/94884528424.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161454cc1698e3---99103284573.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/7718686327.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/44955939826.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/vesibedetujarujujutuwulax.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/17238157303.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/10087136822.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mafezobakisilam.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/wukonakop.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/tedotekagevenowuzif.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/86315453776.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/xutaxo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f53b16ac---90066409877.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/nuvejo.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/bexutapupoma.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14237837272.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/satodawovoreti.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nojuwelagajagetifom.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/436658283.pdfIn PDF document text
    • https://digireg.it/upload/furasopiwevuletot.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sizagotutilimebilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=new+vidmate+app+download+2020PDF 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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 10656 bytes
SHA-256: dd30c56fb94ad925e95cf31a4505224f0f27a289e9e84ef4be3504da44c99ef2
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 17488 bytes
SHA-256: 0533be88bac9dfa4c1088e1751e6722a29eea30c067d5a6f74241bff58f1add0
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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