Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c7566b50a3d803…

MALICIOUS

PDF

78.5 KB Created: 2021-03-02 16:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b86a3fee772ab6fd84d2e675da65263e SHA-1: 27df5f5ff965d8fde2f8dbc9067f64dfede5f4eb SHA-256: c9c7566b50a3d8035d7fa98cc691ee4e0081ad5b858b66822f8fcc41185dab51
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/strik?utm_term=disadvantages+of+sexual+reproduction+in+flowering+plants PDF link annotation
    • http://worldhold.online/adobe_after_effects_cs6_trial_windowsxertb.pdfIn PDF document text
    • http://psychologyrelax.xyz/23846110141pajn2.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/34904.pdfIn PDF document text
    • http://korsabarca.com/kokuzumipawsgkl.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/rurawedenigix.pdfIn PDF document text
    • http://fartook.online/3667982093771jk0.pdfIn PDF document text
    • http://greatholl.com/mississippi_class_d_license_study_gu43i7h.pdfIn PDF document text
    • http://idealica-uficiale.website/google_slides_tri_fold_template99cct.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/ab62f.pdfIn PDF document text
    • http://vehicleusains.com/the_entertainer_billy_joel_pianoylwhx.pdfIn PDF document text
    • http://idclick.cash/how_to_clean_vicks_warm_moisture_humidifier5idbc.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/tuweson-tesetax-mojizirovifine.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/gazivemon/ma_rmv_motorcycle_permit_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/85400262718.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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5544 bytes
SHA-256: 6fb694381b1ea8e5413d2ce28b37065a13a45f80358bb4a07e61e2c418e95391
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 10324 bytes
SHA-256: 3339ca1f0764f28f5b5c73ef84a002c4758507ffa7de47df60a8697edd472d3a

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