Malicious PDF — malware analysis report

Static analysis result for SHA-256 df54989539d1d9bc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 11:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4736d0345466709c0eb0d6f708cc898 SHA-1: 99d86d0aa1efe63c02060ae04c9361faf80287de SHA-256: df54989539d1d9bc7769ca9c2715905afa3b73fe81dc123f1a3ec94953c491ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful 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://ketchas.ru/uplcv?utm_term=watch+tropic+thunder+online+free+putlockers PDF link annotation
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rukuzemiteguri.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/94770810181.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/31276553696.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ludagupuwunolanovetumo.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109180628481698.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c99b4320---bifisodanakufedokiz.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/tikasikuvukolufakelaxepub.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/64986142653.pdfIn PDF document text
    • https://network-italia.com/file/53434097069.pdfIn PDF document text
    • http://agrion.org/upload/fichier/ponolipuxagezagipotibobo.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/nixorifotitiwesopelipun.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bp98l2kuivkueqiira6pqppaa4/45605056153.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/xekatotakamufasotozob.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/xuxezuluxolelaginavagow.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/73425085089.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/42378252209.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/seravetulu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/rarizogiwesakojofa.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/36005159778.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/pebipe.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/56059400701.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wurogaguzobo.pdfIn PDF document text
    • https://partnermind.cz/images/files/8461636292.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vizinugejafagewofurafe.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 17844 bytes
SHA-256: d4fa7eb7a7b022f1d7ed19caddb2d2ac9df534b31335cadb146d64707f897660
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 10900 bytes
SHA-256: f911f25be202ee0e07f58c1e60dffc00c23bf2e4bd49a3c2defa8e07a3d7e1df

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