Malicious PDF — malware analysis report

Static analysis result for SHA-256 549ae50c86ad65e8…

MALICIOUS

PDF

85.3 KB Created: 2021-04-24 21:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5b6ccb25497e0ee52590196acb6041f5 SHA-1: 2999f4c7dcae18b8938be97df5cf61cf79d5372f SHA-256: 549ae50c86ad65e8f12a61a30ab2c305dfdcc2099a0ec5d841e7f7fb8a1f37da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a PDF link farm, with numerous external URLs pointing to other PDF files, suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/strik?utm_term=how+to+eat+healthy+on+a+budget+uk PDF link annotation
    • https://zazanopub.weebly.com/uploads/1/3/2/7/132712119/1162676.pdfIn PDF document text
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/6dd05b3a368c5.pdfIn PDF document text
    • https://dapeborax.weebly.com/uploads/1/3/0/8/130813135/6285157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://leperipuf.rf.gd/election_commission_gujarat_voter_list.pdfIn PDF document text
    • http://wefazor.epizy.com/crossover_ethernet_cable_color_code.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/wogukibo.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/63106708359.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_17ee2b87de4042b595daa331791ec8a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/gws_theme_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/bipekugunipumif.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0bf1b2d5503a4d6a973bb0073ce86b7b.pdf?index=trueIn PDF document text
    • http://fevejalamozek.epizy.com/nexoris.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/wordpress_free_blog_templates_responsive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f4f2e8-aee9-4e8f-a618-d301822e5627/rukusubexesukuzejuf.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/formatos_radiofonicos_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/xoverurewutejokizagijut.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_ae1cf412b2cc47f2a7945c8ea4250889.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe045aa-3b6d-41de-acd1-b7c00d578399/95675538571.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/hang_glider_template.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 5172 bytes
SHA-256: ac1a4a94ea4a1ffeefe34f49b591ae01f9290b48c31565c0aed5b25bfb5b7ae5
font_01_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 11572 bytes
SHA-256: 11c856879718c812ef30e4dc518b2676170cfe0d1e77e4d4d6ce8a907efe14be

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