Malicious PDF — malware analysis report

Static analysis result for SHA-256 486078744a2ecd52…

MALICIOUS

PDF

80.2 KB Created: 2021-05-08 11:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4c67f963e2fe42361d2b6ccddb4253dd SHA-1: d89efd59b6154a936b3dea3739c62aa678bb1e4f SHA-256: 486078744a2ecd52e6c9840e67a53d424f897f4a2e309b348152fea7a0cfc851
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a link farm on disposable hosting, with multiple URLs pointing to potentially malicious content disguised as free downloads. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a large number of outbound links, likely for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=the+game+plan+full+movie+in+hindi+free+download PDF link annotation
    • http://xovitixekewelom.scienceontheweb.net/informantes_claves.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/encyclopedia_of_astronomy_and_astrophysics.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/potuxikew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_6009f6c0d8122.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/febuxu.pdfIn PDF document text
    • http://rubonupulaboti.22web.org/unsafe_abortion_in_ethiopia.pdfIn PDF document text
    • http://jenirafona.22web.org/cancel_button_in_html_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fccf78b0025d.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/4d744ff455805a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipixuge.epizy.com/75158962673.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_d7fad62ff4504f3d95c87b8a9127272d.pdf?index=trueIn PDF document text
    • http://teropisarazo.myartsonline.com/2003_jeep_liberty_electrical_problems.pdfIn PDF document text
    • http://dajaxul.epizy.com/adobe_reader_for_android_2._3.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_93ad51bfa2b245848c0c3355aea8a2cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/78827912749.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/14878947554.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_464f348554d14c1184a7420a310909c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/11033368583.pdfIn PDF document text
    • http://pufigopinenise.epizy.com/97075907047.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_9634d1085550420fa299b45c62e98a10.pdf?index=trueIn PDF document text
    • http://rizivubonulej.atwebpages.com/larami.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_8da0bb97bbb6431d834976a13e07d0cb.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 5376 bytes
SHA-256: ccaf81e16abe8b34638374587e03795524841dcd27976709fec13b81c63bfc5d
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 11152 bytes
SHA-256: 84b4e70287d71e6c3aeee972384804952e60bd0e2c7ffbf58cc70c537cc68dde