Malicious PDF — malware analysis report

Static analysis result for SHA-256 321ba3f8f2276096…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 17:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dde8c5fd5ad63d76a5388ac72819e824 SHA-1: 89a65f008eccfc6b3428191b2f1c92b44f253ec1 SHA-256: 321ba3f8f2276096381f279a0ccf4e6227830af4ec2737d138e33b21a2ebb339
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=s20+fe+sd+slot PDF link annotation
    • https://toocapen.com/files/bekalukavaxodenut.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/zaluronodowasukuvunixun.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/1305333076.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/mazeregidagavejupo.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/51189194160.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/83937633857.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/50990860432.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/r3mb32u685g44999h2plsufs36/zitojunerivumedujebosez.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/32528356555.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/29500815445.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/21680180651.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/terumuguzobibel.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/buxakusabafafilasazosofub.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/jesoridetusiziven.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/vumoru.pdfIn PDF document text
    • http://blgjad.com/upload/files/29261752349.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9225736199.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/43620826519.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/kesexewava.pdfIn PDF document text
    • https://upaspor.com/resimler/files/13902287984.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/zolesifagebanuma.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/98660048849.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/lataduwonoletalufobe.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905070634.pdfIn PDF document text
    • 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 18332 bytes
SHA-256: ae95fca559fb6fd7729c9bcf0821e0b247b38f1591f8ba85846cc09f354b2ee9
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 10208 bytes
SHA-256: 2d3e6d5a720c4600199b4b8745b782a21a17184d74866469e397ffee29428c6b

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