Malicious PDF — malware analysis report

Static analysis result for SHA-256 27130ffb3f88b813…

MALICIOUS

PDF

65.8 KB Created: 2021-02-24 07:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a7d4678740d5b926d78304699b1f0dec SHA-1: 54369c41c045cf897348a654ae9936845fd2dde9 SHA-256: 27130ffb3f88b813f35a407e7d775fa16ec08204d40c7ba2b83084856684dd99
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded links that redirect to known malicious infrastructure and disposable hosting sites, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=final+fantasy+iv+ds+official+complete+guide In PDF document text
    • http://devlp.club/husqvarna_yth_150_belt_diagramke3ow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_600eca688f18c.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/bubesenujllaf.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/neraviz.pdfIn PDF document text
    • http://sait-ok.ru/75597708398d8jcd.pdfIn PDF document text
    • http://itwomen.space/marshmello_net_worth_in_rupeesri5hb.pdfIn PDF document text
    • http://plusstore.pro/river_flows_in_you_virtual_piano_sheet4frb9.pdfIn PDF document text
    • http://itash.space/best_low_voltage_path_lights7gq3y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/53806212516.pdfIn PDF document text
    • http://misovin.epizy.com/dukemepupefekitosivus.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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 5496 bytes
SHA-256: b3244834a5cc5a464930f7d1a22e9690ff58ecfc1cb083b8714c8881b2c42c7a
font_01_sfnt_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 10376 bytes
SHA-256: 9e673215301c01d3890e5ad0f751a29d8eabc04fd434c037d18d4311084aac73

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