Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb7846aefb0b16…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 19:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbd58fb815976576b17a4eb16eb461c0 SHA-1: 2f3c41296729519692dd5bf04aeabcc8e8f09b2c SHA-256: d3bb7846aefb0b1657bfb6f9f21b381cbd1f0e1b4812e6fe709ec4f04ac92bb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=android+phone+your+connection+is+not+private PDF link annotation
    • http://underbutter.cz/download/foto/40401527613.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xoradizixugodadogefive.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/93444070561.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/30358634350.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161408e755f9f9---zibopobiwemumo.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/17517312838.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/kizugaritirumajafaninabi.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/55520515629.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/52906642957.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/bevizigezikas.pdfIn PDF document text
    • http://seamacros.com/upload/file/bowusunijijasimetag.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/tabazinexepisozi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ad096bf6---zopifujekavegikotixepo.pdfIn PDF document text
    • http://warehousetraining.ie/images/xonitusowakasimepiz.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/9505111874.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/76392708376.pdfIn PDF document text
    • https://tebra.si/userfiles/file/najimipovufomeporakufulaz.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/13791950860.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/masopu.pdfIn PDF document text
    • http://consade.com/userfiles/file/jijinosuzuwalavopipiki.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/dakoriwijafibirowabat.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xoduzokukevagopasof.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/96534741915.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/lirumetut.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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 17620 bytes
SHA-256: 9fa738db0cba923378dda129533463db18e586ba1cf1a38d3d4ad32c81bc3374
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 10828 bytes
SHA-256: 8fedf228bf7a2cb448816250713b1be883ecb97600b9b79ee153582ddd2661b0

Open this report in the interactive analyzer, or submit your own file for analysis.