Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cff7acc59204ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 11:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 55f0cb69876315a8f62559a397de1e4c SHA-1: bc9ae0ed1e25173ecfdfcab65aadbde826f5b586 SHA-256: b3cff7acc59204ce8cbedc80caaca4bbf4c6c5c7c9cbf0e10df9d4f25c187672
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link farm operation. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=fix+internet+connection+problems+on+android+devices PDF link annotation
    • https://zebcom.in/userfiles/file/26714382546.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/59744078453.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80417558787.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/zejirijavesola.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/mexokotixazetunerof.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/64753180654.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/jetodutu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/41798514417.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zotixinevuzadusepusur.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/53090372269.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/81382302892.pdfIn PDF document text
    • https://pepsima.biz/files/file/vadimufinakebulekemefe.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/tusaxumemi.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/kitutexisejagapuwunofom.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/49888270120.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/15766442537.pdfIn PDF document text
    • http://ccshecea.org/upload/files/40556641247.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/62131449852.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • http://eko-uklid.com/files/file/5302966787.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bb8518cc---belifugevopetujik.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/59eb95e74c453a8f0eb34d7b12ede862/futevibovilakisiruvitam.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/wemepiwujotopojet.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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 17848 bytes
SHA-256: 6efaaa36ded1331406b151d15ad15c27bb73a623c5268121dc2965507c20fbd0
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 10960 bytes
SHA-256: d36974a10cc835fd495203c2e02b49689f8f32bc6979c1a2323f8a3e48268315
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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