Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b257beacf1ceed…

MALICIOUS

PDF

72.6 KB Created: 2021-09-29 02:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a430b0c0bba183baa39e12867dd3789d SHA-1: 8f3a7d3698f6bbc40e49396bc8777fc95b245d22 SHA-256: f4b257beacf1ceed94441b30f508f4461d4c9b80056c8816b433777e881c5c71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d4dd9ea5---reburibul.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/xegexal.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/gisumomosexojikutuzon.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/bizofizinawebefomawijupow.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/xodetadezifosiful.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/vasijuzakodevidoxuziposax.pdfIn PDF document text
    • http://aweibel.com/Photo/file/2436613737.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-24/20210924110147195308.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/munirikefowo.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/xanotodokakikemomev.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rumipiximibojimezapivo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/18894765698.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/47870193802.pdfIn PDF document text
    • https://pindimana.in/uploads/file/rojopoforojifume.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/roromuzulikivufumavu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/86677239443.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/3953764583.pdfIn PDF document text
    • http://vaithun.net/upload/files/rixuludesilulo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b3bb495ca9c3e607428dad99d8b0977f/lezena.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/5437473160.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109132246506462.pdfIn PDF document text
    • http://pachinkoevent.com/sites/default/files/file/51697350447.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/19774739448.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/lifolezilaxigovedod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=galaxy+s9%2B+screen+sizePDF 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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 10488 bytes
SHA-256: 5347a5b77ba81d634633cd51f612937f797e636fd0449116dd7764ac86eea304
font_02_sfnt_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 17936 bytes
SHA-256: 8c58022cae579d57f577d8952aa17dce29cde6a9b281440b1dc63abbe3c48f28