Malicious PDF — malware analysis report

Static analysis result for SHA-256 93485b38b9f0caf0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 14:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 36dcf602fb0532c57ef71f9fb2104006 SHA-1: d2361cafd71be88f10c18c52b1a0c713830d7779 SHA-256: 93485b38b9f0caf047e1b61be7a98b92e3bb3f3cef41e1e4671210d4af143d63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs pointing to a link farm, a common technique for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://loadcell.vn/Images_upload/files/demuzef.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/tulagukewukosevapo.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/58509682916.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/79914103111.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/64873352324.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/16895411417.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/zulowugabi.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/kogodinanozu.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/rizobunakopidopoxo.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/tewidemabirimorema.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6t7t4aardl26rdnc6pstr01ehe/34830025815.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/31785178683.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lipikigimoziwilavi.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/16477586915.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/91017980817.pdfIn PDF document text
    • https://siroyensao.com/upload/files/83938488853.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/vuronusawolowi.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/bulenudepawe.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/kegufuripilif.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/12906019419.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/luviruvatetezinikazolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+star+finderPDF 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_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 10280 bytes
SHA-256: a3fba8d8a36494a12b25d0aae85ab46d8fa432c96f342ce380a6a011dc7e1a1e
font_01_sfnt_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 17744 bytes
SHA-256: 3b863785d2f2e0234aa32caa67a0663545aa153b65a7f5eadd439c6aa76b457e
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1